Typecheck: add regions (lifetimes) to TyTy

Typecheck: add regions (lifetimes) to TyTy

gcc/rust/ChangeLog:

	* typecheck/rust-hir-trait-resolve.cc: add regions
	* typecheck/rust-hir-type-check-base.cc (TypeCheckBase::resolve_literal):
	add regions, resolve generic lifetimes
	* typecheck/rust-hir-type-check-expr.cc (TypeCheckExpr::visit): add regions
	* typecheck/rust-hir-type-check-implitem.cc (TypeCheckTopLevelExternItem::visit):
	add regions, resolve lifetimes
	(TypeCheckImplItem::visit): add regions, resove lifetimes
	* typecheck/rust-hir-type-check-implitem.h: add default value for result
	* typecheck/rust-hir-type-check-item.cc (TypeCheckItem::visit): add regions,
	resove lifetimes
	(TypeCheckItem::resolve_impl_block_substitutions): add regions, resove lifetimes
	* typecheck/rust-hir-type-check-path.cc (TypeCheckExpr::visit): add regions,
	resove lifetimes
	(TypeCheckExpr::resolve_root_path): add regions, resove lifetimes
	(TypeCheckExpr::resolve_segments): add regions, resove lifetimes
	* typecheck/rust-hir-type-check-type.cc (TypeCheckType::visit): add regions,
	resove lifetimes
	(TypeCheckType::resolve_root_path): add regions, resove lifetimes
	(ResolveWhereClauseItem::Resolve): add regions, resove lifetimes
	(ResolveWhereClauseItem::visit): add regions, resove lifetimes
	* typecheck/rust-hir-type-check.cc (TypeCheckContext::LifetimeResolver::resolve):
	add regions, resolve lifetimes
	(TraitItemReference::get_type_from_fn): add regions, resove lifetimes
	* typecheck/rust-hir-type-check.h: add regions, resove lifetimes
	* typecheck/rust-substitution-mapper.cc (SubstMapper::SubstMapper): add regions,
	resove lifetimes
	(SubstMapper::Resolve): add regions, resove lifetimes
	(SubstMapper::InferSubst): add regions, resove lifetimes
	(SubstMapper::visit): add regions, resove lifetimes
	* typecheck/rust-substitution-mapper.h: add regions, resove lifetimes
	* typecheck/rust-typecheck-context.cc (TypeCheckContext::TypeCheckContext):
	lifetime resolution
	(TypeCheckContext::regions_from_generic_args): lifetime resolution helper
	* typecheck/rust-tyty-bounds.cc (TypeBoundPredicate::TypeBoundPredicate):
	add regions, resove lifetimes
	(TypeBoundPredicate::operator=): add regions, resove lifetimes
	(TypeBoundPredicate::apply_generic_arguments): add regions, resove lifetimes
	(TypeBoundPredicateItem::get_tyty_for_receiver): add regions, resove lifetimes
	* typecheck/rust-tyty-subst.cc (SubstitutionArgumentMappings::get_regions):
	add regions, resove lifetimes
	(SubstitutionArgumentMappings::get_mut_regions): getter
	(SubstitutionArgumentMappings::error): split error and empty
	(SubstitutionArgumentMappings::empty): split error and empty
	(SubstitutionArgumentMappings::find_symbol): helper
	(SubstitutionRef::get_num_lifetime_params): getter
	(SubstitutionRef::get_num_type_params): getter
	(SubstitutionRef::needs_substitution): extend to regions
	(SubstitutionRef::get_mappings_from_generic_args): helper
	(SubstitutionRef::infer_substitions): add regions
	* typecheck/rust-tyty-subst.h (class RegionParamList): region param handler
	* typecheck/rust-tyty.cc (BaseType::monomorphized_clone): add regions, resove lifetimes
	(InferType::default_type): add regions, resove lifetimes
	(FnType::clone): add regions, resove lifetimes
	(ReferenceType::ReferenceType): add regions
	(ReferenceType::get_region): getter
	(ReferenceType::clone): add regions
	* typecheck/rust-tyty.h: add regions, resove

Signed-off-by: Jakub Dupak <dev@jakubdupak.com>