gccrs: refactor string methods in HIR

gccrs: refactor string methods in HIR

This patch changes as_string methods in HIR to to_string,
we also create a to_debug_string method at the parent class of every
HIR nodes.

gcc/rust/ChangeLog:

	* backend/rust-compile-implitem.h: Change as_string to to_string.
	* backend/rust-compile-type.cc (TyTyResolveCompile::visit): Likewise.
	* checks/errors/rust-readonly-check.cc (ReadonlyChecker::check_variable): Likewise.
	* hir/rust-hir-dump.cc (Dump::do_vis_item): Likewise.
	(Dump::do_pathpattern): Likewise.
	(Dump::do_typepathsegment): Likewise.
	(Dump::do_baseloopexpr): Likewise.
	(Dump::do_struct): Likewise.
	(Dump::do_traitfunctiondecl): Likewise.
	(Dump::do_externalitem): Likewise.
	(Dump::do_tuplefield): Likewise.
	(Dump::do_structfield): Likewise.
	(Dump::visit): Likewise.
	* hir/tree/rust-hir-bound-abstract.h: Likewise.
	* hir/tree/rust-hir-bound.h: Likewise.
	* hir/tree/rust-hir-expr-abstract.h: Likewise.
	* hir/tree/rust-hir-expr.cc (OffsetOf::as_string): Likewise.
	(OffsetOf::to_string): Likewise.
	* hir/tree/rust-hir-expr.h: Likewise.
	* hir/tree/rust-hir-generic-param.cc (ConstGenericParam::as_string): Likewise.
	(ConstGenericParam::to_string): Likewise.
	* hir/tree/rust-hir-generic-param.h: Likewise.
	* hir/tree/rust-hir-item.h: Likewise.
	* hir/tree/rust-hir-path.cc (PathInExpression::is_self): Likewise.
	* hir/tree/rust-hir-path.h: Likewise.
	* hir/tree/rust-hir-pattern-abstract.h: Likewise.
	* hir/tree/rust-hir-pattern.h: Likewise.
	* hir/tree/rust-hir-stmt.h: Likewise.
	* hir/tree/rust-hir-trait-bound.h: Likewise.
	* hir/tree/rust-hir-type-abstract.h: Likewise.
	* hir/tree/rust-hir-type.h: Likewise.
	* hir/tree/rust-hir-visibility.h: Likewise.
	* hir/tree/rust-hir.cc (Crate::as_string): Likewise.
	(Crate::to_string): Likewise.
	(Visibility::as_string): Likewise.
	(Visibility::to_string): Likewise.
	(VisItem::as_string): Likewise.
	(VisItem::to_string): Likewise.
	(Item::as_string): Likewise.
	(Item::to_string): Likewise.
	(Module::as_string): Likewise.
	(Module::to_string): Likewise.
	(StaticItem::as_string): Likewise.
	(StaticItem::to_string): Likewise.
	(ExternCrate::as_string): Likewise.
	(ExternCrate::to_string): Likewise.
	(TupleStruct::as_string): Likewise.
	(TupleStruct::to_string): Likewise.
	(ConstantItem::as_string): Likewise.
	(ConstantItem::to_string): Likewise.
	(ImplBlock::as_string): Likewise.
	(ImplBlock::to_string): Likewise.
	(StructStruct::as_string): Likewise.
	(StructStruct::to_string): Likewise.
	(UseDeclaration::as_string): Likewise.
	(UseDeclaration::to_string): Likewise.
	(UseTreeGlob::as_string): Likewise.
	(UseTreeGlob::to_string): Likewise.
	(UseTreeList::as_string): Likewise.
	(UseTreeList::to_string): Likewise.
	(UseTreeRebind::as_string): Likewise.
	(UseTreeRebind::to_string): Likewise.
	(Enum::as_string): Likewise.
	(Enum::to_string): Likewise.
	(Trait::as_string): Likewise.
	(Trait::to_string): Likewise.
	(Union::as_string): Likewise.
	(Union::to_string): Likewise.
	(Function::as_string): Likewise.
	(Function::to_string): Likewise.
	(WhereClause::as_string): Likewise.
	(WhereClause::to_string): Likewise.
	(BlockExpr::as_string): Likewise.
	(BlockExpr::to_string): Likewise.
	(AnonConst::as_string): Likewise.
	(AnonConst::to_string): Likewise.
	(ConstBlock::as_string): Likewise.
	(ConstBlock::to_string): Likewise.
	(TypeAlias::as_string): Likewise.
	(TypeAlias::to_string): Likewise.
	(ExternBlock::as_string): Likewise.
	(ExternBlock::to_string): Likewise.
	(PathInExpression::as_string): Likewise.
	(PathInExpression::to_string): Likewise.
	(ExprStmt::as_string): Likewise.
	(ExprStmt::to_string): Likewise.
	(ClosureParam::as_string): Likewise.
	(ClosureParam::to_string): Likewise.
	(ClosureExpr::as_string): Likewise.
	(ClosureExpr::to_string): Likewise.
	(PathPattern::as_string): Likewise.
	(PathPattern::to_string): Likewise.
	(QualifiedPathType::as_string): Likewise.
	(QualifiedPathType::to_string): Likewise.
	(QualifiedPathInExpression::as_string): Likewise.
	(QualifiedPathInExpression::to_string): Likewise.
	(BorrowExpr::as_string): Likewise.
	(BorrowExpr::to_string): Likewise.
	(ReturnExpr::as_string): Likewise.
	(ReturnExpr::to_string): Likewise.
	(GroupedExpr::as_string): Likewise.
	(GroupedExpr::to_string): Likewise.
	(RangeToExpr::as_string): Likewise.
	(RangeToExpr::to_string): Likewise.
	(ContinueExpr::as_string): Likewise.
	(ContinueExpr::to_string): Likewise.
	(NegationExpr::as_string): Likewise.
	(NegationExpr::to_string): Likewise.
	(RangeFromExpr::as_string): Likewise.
	(RangeFromExpr::to_string): Likewise.
	(RangeFullExpr::as_string): Likewise.
	(RangeFullExpr::to_string): Likewise.
	(ArrayIndexExpr::as_string): Likewise.
	(ArrayIndexExpr::to_string): Likewise.
	(AssignmentExpr::as_string): Likewise.
	(AssignmentExpr::to_string): Likewise.
	(CompoundAssignmentExpr::as_string): Likewise.
	(CompoundAssignmentExpr::to_string): Likewise.
	(AsyncBlockExpr::as_string): Likewise.
	(AsyncBlockExpr::to_string): Likewise.
	(ComparisonExpr::as_string): Likewise.
	(ComparisonExpr::to_string): Likewise.
	(MethodCallExpr::as_string): Likewise.
	(MethodCallExpr::to_string): Likewise.
	(TupleIndexExpr::as_string): Likewise.
	(TupleIndexExpr::to_string): Likewise.
	(DereferenceExpr::as_string): Likewise.
	(DereferenceExpr::to_string): Likewise.
	(FieldAccessExpr::as_string): Likewise.
	(FieldAccessExpr::to_string): Likewise.
	(LazyBooleanExpr::as_string): Likewise.
	(LazyBooleanExpr::to_string): Likewise.
	(RangeFromToExpr::as_string): Likewise.
	(RangeFromToExpr::to_string): Likewise.
	(RangeToInclExpr::as_string): Likewise.
	(RangeToInclExpr::to_string): Likewise.
	(UnsafeBlockExpr::as_string): Likewise.
	(UnsafeBlockExpr::to_string): Likewise.
	(IfExpr::as_string): Likewise.
	(IfExpr::to_string): Likewise.
	(IfExprConseqElse::as_string): Likewise.
	(IfExprConseqElse::to_string): Likewise.
	(RangeFromToInclExpr::as_string): Likewise.
	(RangeFromToInclExpr::to_string): Likewise.
	(ErrorPropagationExpr::as_string): Likewise.
	(ErrorPropagationExpr::to_string): Likewise.
	(ArithmeticOrLogicalExpr::as_string): Likewise.
	(ArithmeticOrLogicalExpr::to_string): Likewise.
	(CallExpr::as_string): Likewise.
	(CallExpr::to_string): Likewise.
	(WhileLoopExpr::as_string): Likewise.
	(WhileLoopExpr::to_string): Likewise.
	(WhileLetLoopExpr::as_string): Likewise.
	(WhileLetLoopExpr::to_string): Likewise.
	(LoopExpr::as_string): Likewise.
	(LoopExpr::to_string): Likewise.
	(ArrayExpr::as_string): Likewise.
	(ArrayExpr::to_string): Likewise.
	(AwaitExpr::as_string): Likewise.
	(AwaitExpr::to_string): Likewise.
	(BreakExpr::as_string): Likewise.
	(BreakExpr::to_string): Likewise.
	(LoopLabel::as_string): Likewise.
	(LoopLabel::to_string): Likewise.
	(MatchArm::as_string): Likewise.
	(MatchArm::to_string): Likewise.
	(MatchCase::as_string): Likewise.
	(MatchCase::to_string): Likewise.
	(MatchCaseBlockExpr::as_string): Likewise.
	(MatchCaseBlockExpr::to_string): Likewise.
	(MatchCaseExpr::as_string): Likewise.
	(MatchCaseExpr::to_string): Likewise.
	(MatchExpr::as_string): Likewise.
	(MatchExpr::to_string): Likewise.
	(TupleExpr::as_string): Likewise.
	(TupleExpr::to_string): Likewise.
	(FunctionParam::as_string): Likewise.
	(FunctionParam::to_string): Likewise.
	(FunctionQualifiers::as_string): Likewise.
	(FunctionQualifiers::to_string): Likewise.
	(TraitBound::as_string): Likewise.
	(TraitBound::to_string): Likewise.
	(LifetimeParam::as_string): Likewise.
	(LifetimeParam::to_string): Likewise.
	(QualifiedPathInType::as_string): Likewise.
	(QualifiedPathInType::to_string): Likewise.
	(Lifetime::as_string): Likewise.
	(Lifetime::to_string): Likewise.
	(TypePath::as_string): Likewise.
	(TypePath::to_string): Likewise.
	(TypeParam::as_string): Likewise.
	(TypeParam::to_string): Likewise.
	(PathPattern::convert_to_simple_path): Likewise.
	(TypePath::as_simple_path): Likewise.
	(PathExprSegment::as_string): Likewise.
	(PathExprSegment::to_string): Likewise.
	(GenericArgs::as_string): Likewise.
	(GenericArgs::to_string): Likewise.
	(GenericArgsBinding::as_string): Likewise.
	(GenericArgsBinding::to_string): Likewise.
	(RangePattern::as_string): Likewise.
	(RangePattern::to_string): Likewise.
	(RangePatternBoundLiteral::as_string): Likewise.
	(RangePatternBoundLiteral::to_string): Likewise.
	(SlicePatternItemsNoRest::as_string): Likewise.
	(SlicePatternItemsNoRest::to_string): Likewise.
	(SlicePatternItemsHasRest::as_string): Likewise.
	(SlicePatternItemsHasRest::to_string): Likewise.
	(SlicePattern::as_string): Likewise.
	(SlicePattern::to_string): Likewise.
	(AltPattern::as_string): Likewise.
	(AltPattern::to_string): Likewise.
	(TuplePatternItemsNoRest::as_string): Likewise.
	(TuplePatternItemsNoRest::to_string): Likewise.
	(TuplePatternItemsHasRest::as_string): Likewise.
	(TuplePatternItemsHasRest::to_string): Likewise.
	(TuplePattern::as_string): Likewise.
	(TuplePattern::to_string): Likewise.
	(StructPatternField::as_string): Likewise.
	(StructPatternField::to_string): Likewise.
	(StructPatternFieldIdent::as_string): Likewise.
	(StructPatternFieldIdent::to_string): Likewise.
	(StructPatternFieldTuplePat::as_string): Likewise.
	(StructPatternFieldTuplePat::to_string): Likewise.
	(StructPatternFieldIdentPat::as_string): Likewise.
	(StructPatternFieldIdentPat::to_string): Likewise.
	(StructPatternElements::as_string): Likewise.
	(StructPatternElements::to_string): Likewise.
	(StructPattern::as_string): Likewise.
	(StructPattern::to_string): Likewise.
	(LiteralPattern::as_string): Likewise.
	(LiteralPattern::to_string): Likewise.
	(ReferencePattern::as_string): Likewise.
	(ReferencePattern::to_string): Likewise.
	(IdentifierPattern::as_string): Likewise.
	(IdentifierPattern::to_string): Likewise.
	(TupleStructItemsNoRest::as_string): Likewise.
	(TupleStructItemsNoRest::to_string): Likewise.
	(TupleStructItemsHasRest::as_string): Likewise.
	(TupleStructItemsHasRest::to_string): Likewise.
	(TupleStructPattern::as_string): Likewise.
	(TupleStructPattern::to_string): Likewise.
	(LetStmt::as_string): Likewise.
	(LetStmt::to_string): Likewise.
	(Expr::as_string): Likewise.
	(Expr::to_string): Likewise.
	(InferredType::as_string): Likewise.
	(InferredType::to_string): Likewise.
	(TypeCastExpr::as_string): Likewise.
	(TypeCastExpr::to_string): Likewise.
	(ImplTraitType::as_string): Likewise.
	(ImplTraitType::to_string): Likewise.
	(ReferenceType::as_string): Likewise.
	(ReferenceType::to_string): Likewise.
	(RawPointerType::as_string): Likewise.
	(RawPointerType::to_string): Likewise.
	(TraitObjectType::as_string): Likewise.
	(TraitObjectType::to_string): Likewise.
	(BareFunctionType::as_string): Likewise.
	(BareFunctionType::to_string): Likewise.
	(TypePathSegmentGeneric::as_string): Likewise.
	(TypePathSegmentGeneric::to_string): Likewise.
	(TypePathFunction::as_string): Likewise.
	(TypePathFunction::to_string): Likewise.
	(TypePathSegmentFunction::as_string): Likewise.
	(TypePathSegmentFunction::to_string): Likewise.
	(ArrayType::as_string): Likewise.
	(ArrayType::to_string): Likewise.
	(SliceType::as_string): Likewise.
	(SliceType::to_string): Likewise.
	(TupleType::as_string): Likewise.
	(TupleType::to_string): Likewise.
	(StructExpr::as_string): Likewise.
	(StructExpr::to_string): Likewise.
	(StructExprStruct::as_string): Likewise.
	(StructExprStruct::to_string): Likewise.
	(StructBase::as_string): Likewise.
	(StructBase::to_string): Likewise.
	(StructExprFieldWithVal::as_string): Likewise.
	(StructExprFieldWithVal::to_string): Likewise.
	(StructExprFieldIdentifierValue::as_string): Likewise.
	(StructExprFieldIdentifierValue::to_string): Likewise.
	(StructExprFieldIndexValue::as_string): Likewise.
	(StructExprFieldIndexValue::to_string): Likewise.
	(StructExprStructFields::as_string): Likewise.
	(StructExprStructFields::to_string): Likewise.
	(EnumItem::as_string): Likewise.
	(EnumItem::to_string): Likewise.
	(EnumItemTuple::as_string): Likewise.
	(EnumItemTuple::to_string): Likewise.
	(TupleField::as_string): Likewise.
	(TupleField::to_string): Likewise.
	(EnumItemStruct::as_string): Likewise.
	(EnumItemStruct::to_string): Likewise.
	(StructField::as_string): Likewise.
	(StructField::to_string): Likewise.
	(EnumItemDiscriminant::as_string): Likewise.
	(EnumItemDiscriminant::to_string): Likewise.
	(ExternalItem::as_string): Likewise.
	(ExternalItem::to_string): Likewise.
	(ExternalStaticItem::as_string): Likewise.
	(ExternalStaticItem::to_string): Likewise.
	(ExternalFunctionItem::as_string): Likewise.
	(ExternalFunctionItem::to_string): Likewise.
	(ExternalTypeItem::as_string): Likewise.
	(ExternalTypeItem::to_string): Likewise.
	(NamedFunctionParam::as_string): Likewise.
	(NamedFunctionParam::to_string): Likewise.
	(attr.as_string): Likewise.
	(attr.to_string): Likewise.
	(TraitItemFunc::as_string): Likewise.
	(TraitItemFunc::to_string): Likewise.
	(TraitFunctionDecl::as_string): Likewise.
	(TraitFunctionDecl::to_string): Likewise.
	(TraitItemConst::as_string): Likewise.
	(TraitItemConst::to_string): Likewise.
	(TraitItemType::as_string): Likewise.
	(TraitItemType::to_string): Likewise.
	(SelfParam::as_string): Likewise.
	(SelfParam::to_string): Likewise.
	(ArrayElemsCopied::as_string): Likewise.
	(ArrayElemsCopied::to_string): Likewise.
	(LifetimeWhereClauseItem::as_string): Likewise.
	(LifetimeWhereClauseItem::to_string): Likewise.
	(TypeBoundWhereClauseItem::as_string): Likewise.
	(TypeBoundWhereClauseItem::to_string): Likewise.
	(ArrayElemsValues::as_string): Likewise.
	(ArrayElemsValues::to_string): Likewise.
	(MaybeNamedParam::as_string): Likewise.
	(MaybeNamedParam::to_string): Likewise.
	* hir/tree/rust-hir.h: Likewise.
	* rust-session-manager.cc (Session::dump_hir): Likewise.
	* typecheck/rust-hir-dot-operator.cc (MethodResolver::select): Likewise.
	* typecheck/rust-hir-path-probe.cc (PathProbeType::visit): Likewise.
	(PathProbeType::process_enum_item_for_candiates): Likewise.
	* typecheck/rust-hir-path-probe.h: Likewise.
	* typecheck/rust-hir-type-check-expr.cc (emit_ambiguous_resolution_error): Likewise.
	(TypeCheckExpr::visit): Likewise.
	(TypeCheckExpr::resolve_fn_trait_call): Likewise.
	* typecheck/rust-hir-type-check-path.cc (TypeCheckExpr::visit): Likewise.
	(TypeCheckExpr::resolve_root_path): Likewise.
	* typecheck/rust-hir-type-check-pattern.cc (TypeCheckPattern::visit): Likewise.
	* typecheck/rust-hir-type-check-type.cc (TypeCheckType::visit): Likewise.
	(TypeCheckType::resolve_root_path): Likewise.
	(ResolveWhereClauseItem::visit): Likewise.
	* typecheck/rust-tyty-bounds.cc: Likewise.
	* typecheck/rust-tyty.cc (VariantDef::as_string): Likewise.
	(FnType::as_string): Likewise.

Signed-off-by: Lucas Ly Ba <lucas.ly-ba@outlook.com>