gccrs: Fix handling of generic arguments for lifetimes only

gccrs: Fix handling of generic arguments for lifetimes only

We might have generics that are only for lifetimes this is a bad error
check. We can simply rely on the function to marshall the HIR generics
arguements for the type system to do the error handling for us which will
be more acurate anyway.

Fixes #2043 #2039

gcc/rust/ChangeLog:

	* resolve/rust-ast-resolve-item.cc (ResolveTraitItems::visit):
	add check for reference marker and type's in self params
	(ResolveItem::visit): likewise
	* typecheck/rust-hir-type-check-path.cc (TypeCheckExpr::resolve_root_path):
	remove bad generics check
	(TypeCheckExpr::resolve_segments): likewise
	* typecheck/rust-hir-type-check-type.cc (TypeCheckType::resolve_root_path): likewise

gcc/testsuite/ChangeLog:

	* rust/compile/const_generics_5.rs: update test case
	* rust/compile/issue-2043.rs: New test.
	* rust/compile/issue-2039.rs: New test.

Signed-off-by: Philip Herron <herron.philip@googlemail.com>