gccrs: ast: Change Identifier definition

gccrs: ast: Change Identifier definition

Change Identifier type definition from a simple typedef to a whole class
with it's own node id.

gcc/rust/ChangeLog:

	* ast/rust-ast-collector.cc (TokenCollector::visit): Change with
	call to getter.
	* ast/rust-ast.cc (Module::as_string): Likewise.
	(StaticItem::as_string): Likewise.
	(TupleStruct::as_string): Likewise.
	(Method::as_string): Likewise.
	(StructStruct::as_string): Likewise.
	(UseTreeRebind::as_string): Likewise.
	(Enum::as_string): Likewise.
	(Trait::as_string): Likewise.
	(Union::as_string): Likewise.
	(Function::as_string): Likewise.
	(TypeAlias::as_string): Likewise.
	(MacroRulesDefinition::as_string): Likewise.
	(FieldAccessExpr::as_string): Likewise.
	(MacroMatchFragment::as_string): Likewise.
	(TypeParam::as_string): Likewise.
	(StructExprFieldIdentifierValue::as_string): Likewise.
	(EnumItem::as_string): Likewise.
	(StructField::as_string): Likewise.
	(ExternalTypeItem::as_string): Likewise.
	(ExternalStaticItem::as_string): Likewise.
	(ExternalFunctionItem::as_string): Likewise.
	(TraitFunctionDecl::as_string): Likewise.
	(TraitMethodDecl::as_string): Likewise.
	(TraitItemConst::as_string): Likewise.
	(TraitItemType::as_string): Likewise.
	(MaybeNamedParam::as_string): Likewise.
	(MetaListPaths::as_string): Likewise.
	(MetaListNameValueStr::as_string): Likewise.
	(Module::process_file_path): Likewise.
	(MetaListNameValueStr::check_cfg_predicate): Likewise.
	(MetaListPaths::check_cfg_predicate): Likewise.
	(MetaWord::check_cfg_predicate): Likewise.
	(MetaNameValueStr::check_cfg_predicate): Likewise.
	(MetaNameValueStr::to_attribute): Likewise.
	(MetaWord::to_attribute): Likewise.
	(MetaListPaths::to_attribute): Likewise.
	(MetaListNameValueStr::to_attribute): Likewise.
	(operator<<): Change Identifier class <<
	operator overload for standard output stream.
	* ast/rust-ast.h (class Identifier): Change typedef to proper
	class definition.
	(operator<<): Add prototype for operator overload.
	(class Token): Change getter identifier.
	(class MetaListNameValueStr): Likewise.
	(class PathExpr): Likewise.
	* ast/rust-expr.h: Likewise.
	* ast/rust-item.h: Likewise.
	* ast/rust-macro.h: Likewise.
	* ast/rust-path.cc (GenericArg::disambiguate_to_type): Likewise.
	(GenericArgsBinding::as_string): Likewise.
	(ConstGenericParam::as_string): Likewise.
	* ast/rust-path.h: Likewise.
	* ast/rust-pattern.cc (IdentifierPattern::as_string): Likewise.
	(StructPatternFieldIdentPat::as_string): Likewise.
	(StructPatternFieldIdent::as_string): Likewise.
	* ast/rust-type.h: Likewise.
	* backend/rust-compile-base.cc: Likewise.
	* backend/rust-compile-expr.cc (CompileExpr::visit): Likewise.
	* backend/rust-compile-extern.h: Likewise.
	* backend/rust-compile-fnparam.cc (CompileFnParam::visit):
	Likewise.
	* backend/rust-compile-implitem.cc (CompileTraitItem::visit):
	Likewise.
	* backend/rust-compile-item.cc (CompileItem::visit): Likewise.
	* backend/rust-compile-pattern.cc (CompilePatternBindings::visit): Likewise.
	* backend/rust-compile-struct-field-expr.cc (CompileStructExprField::visit):
	Likewise.
	* backend/rust-compile-var-decl.h: Likewise.
	* backend/rust-compile.cc: Likewise.
	* checks/errors/rust-unsafe-checker.cc (check_extern_call):
	Likewise.
	* checks/lints/rust-lint-marklive.cc (MarkLive::visit):
	Likewise.
	* checks/lints/rust-lint-scan-deadcode.h: Likewise.
	* expand/rust-derive-clone.cc (DeriveClone::clone_fn): Likewise.
	(DeriveClone::visit_tuple): Likewise.
	(DeriveClone::visit_struct): Likewise.
	(DeriveClone::visit_union): Likewise.
	* expand/rust-derive-copy.cc (DeriveCopy::visit_struct):
	Likewise.
	(DeriveCopy::visit_tuple): Likewise.
	(DeriveCopy::visit_enum): Likewise.
	(DeriveCopy::visit_union): Likewise.
	* expand/rust-macro-expand.cc (MacroExpander::match_matcher):
	Likewise.
	(MacroExpander::match_n_matches): Likewise.
	(MacroExpander::match_repetition): Likewise.
	(MacroExpander::match_repetition_skipped_metavars): Likewise.
	* hir/rust-ast-lower-base.cc (struct_field_name_exists):
	Likewise.
	* hir/rust-ast-lower-expr.cc (ASTLoweringExpr::visit): Likewise.
	* hir/rust-ast-lower-type.cc (ASTLowerGenericParam::visit):
	Likewise.
	* hir/rust-hir-dump.cc (Dump::visit): Likewise.
	* hir/tree/rust-hir-expr.h: Likewise.
	* hir/tree/rust-hir-item.h: Likewise.
	* hir/tree/rust-hir-path.h: Likewise.
	* hir/tree/rust-hir-type.h: Likewise.
	* hir/tree/rust-hir.cc (Module::as_string): Likewise.
	(StaticItem::as_string): Likewise.
	(TupleStruct::as_string): Likewise.
	(ConstantItem::as_string): Likewise.
	(StructStruct::as_string): Likewise.
	(UseTreeRebind::as_string): Likewise.
	(Enum::as_string): Likewise.
	(Trait::as_string): Likewise.
	(Union::as_string): Likewise.
	(Function::as_string): Likewise.
	(TypeAlias::as_string): Likewise.
	(FieldAccessExpr::as_string): Likewise.
	(TypeParam::as_string): Likewise.
	(GenericArgsBinding::as_string): Likewise.
	(StructPatternFieldIdent::as_string): Likewise.
	(StructPatternFieldIdentPat::as_string): Likewise.
	(IdentifierPattern::as_string): Likewise.
	(StructExprFieldIdentifierValue::as_string): Likewise.
	(EnumItem::as_string): Likewise.
	(StructField::as_string): Likewise.
	(ExternalStaticItem::as_string): Likewise.
	(ExternalFunctionItem::as_string): Likewise.
	(NamedFunctionParam::as_string): Likewise.
	(TraitFunctionDecl::as_string): Likewise.
	(TraitItemConst::as_string): Likewise.
	(TraitItemType::as_string): Likewise.
	(MaybeNamedParam::as_string): Likewise.
	* hir/tree/rust-hir.h: Likewise.
	* parse/rust-parse-impl.h (Parser::parse_macro_match_fragment):
	Likewise.
	(Parser::parse_module): Likewise.
	(Parser::parse_use_tree): Likewise.
	(Parser::parse_maybe_named_param): Likewise.
	* resolve/rust-ast-resolve-implitem.h: Likewise.
	* resolve/rust-ast-resolve-item.cc (ResolveTraitItems::visit):
	Likewise.
	(ResolveItem::visit): Likewise.
	(flatten_rebind): Likewise.
	(ResolveExternItem::visit): Likewise.
	(rust_flatten_rebind): Likewise.
	(rust_flatten_rebind_nested): Likewise.
	* resolve/rust-ast-resolve-pattern.cc (PatternDeclaration::go):
	Likewise.
	(PatternDeclaration::visit): Likewise.
	(PatternDeclaration::add_new_binding): Likewise.
	* resolve/rust-ast-resolve-stmt.h: Likewise.
	* resolve/rust-ast-resolve-toplevel.h: Likewise.
	* resolve/rust-ast-resolve-type.h: Likewise.
	* resolve/rust-early-name-resolver.cc (EarlyNameResolver::visit): Likewise.
	* typecheck/rust-autoderef.cc: Likewise.
	* typecheck/rust-hir-dot-operator.cc (MethodResolver::select):
	Likewise.
	* typecheck/rust-hir-path-probe.cc (PathProbeType::visit):
	Likewise.
	* typecheck/rust-hir-trait-reference.cc (TraitReference::get_name): Likewise.
	* typecheck/rust-hir-trait-resolve.cc (ResolveTraitItemToRef::visit): Likewise.
	(TraitResolver::resolve_trait): Likewise.
	(TraitItemReference::resolve_item): Likewise.
	(AssociatedImplTrait::setup_raw_associated_types): Likewise.
	* typecheck/rust-hir-type-check-enumitem.cc (TypeCheckEnumItem::visit): Likewise.
	* typecheck/rust-hir-type-check-expr.cc (TypeCheckExpr::visit):
	Likewise.
	* typecheck/rust-hir-type-check-implitem.cc (TypeCheckTopLevelExternItem::visit): Likewise.
	(TypeCheckImplItem::visit): Likewise.
	(TypeCheckImplItemWithTrait::visit): Likewise.
	* typecheck/rust-hir-type-check-item.cc (TypeCheckItem::visit):
	Likewise.
	* typecheck/rust-hir-type-check-pattern.cc (TypeCheckPattern::visit): Likewise.
	* typecheck/rust-hir-type-check-struct.cc (TypeCheckStructExpr::visit): Likewise.
	* typecheck/rust-hir-type-check-type.cc (TypeResolveGenericParam::visit): Likewise.
	* typecheck/rust-hir-type-check.cc (TraitItemReference::get_type_from_fn): Likewise.
	* typecheck/rust-tyty-subst.cc (SubstitutionRef::get_mappings_from_generic_args): Likewise.
	* util/rust-attributes.cc (check_doc_attribute): Likewise.
	* util/rust-hir-map.cc (Mappings::insert_macro_def): Likewise.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>