gccrs: tychk: Add more support for additional trait bounds in functions

gccrs: tychk: Add more support for additional trait bounds in functions

This commit correctly lowers and typechecks parenthesized types, which are used for trait objects with additional bounds.

gcc/rust/ChangeLog:

	* resolve/rust-ast-resolve-type.cc (ResolveType::visit): New visitor to handle
	ParenthesizedType.
	* resolve/rust-ast-resolve-type.h: Likewise.
	* typecheck/rust-hir-type-check-type.cc (TypeCheckType::visit): Likewise.
	* typecheck/rust-hir-type-check-type.h: Likewise.

gcc/testsuite/ChangeLog:

	* rust/compile/auto_traits2.rs: New test.
	* rust/compile/auto_traits3.rs: New test.
	* rust/compile/nr2/exclude: Add auto_traits2 test.