Prevent multiple resolution insertion

Prevent multiple resolution insertion

gcc/rust/ChangeLog:

	* expand/rust-derive-clone.cc
	(DeriveClone::clone_impl): Avoid using the same node id multiple
	times.
	(DeriveClone::clone_enum_identifier): Likewise.
	(DeriveClone::clone_enum_tuple): Likewise.
	* expand/rust-derive-copy.cc
	(DeriveCopy::copy_impl): Likewise.
	* resolve/rust-ast-resolve-item.cc
	(flatten_list): Likewise.
	* resolve/rust-ast-resolve-path.cc
	(ResolvePath::resolve_path): Prevent reinsertion of resolutions.
	* resolve/rust-ast-resolve-type.cc
	(ResolveRelativeTypePath::go): Likewise.
	* typecheck/rust-hir-type-check-expr.cc
	(TypeCheckExpr::resolve_fn_trait_call): Likewise.
	* resolve/rust-name-resolver.cc
	(Resolver::insert_resolved_name): Catch multiple resolution
	insertions.
	(Resolver::insert_resolved_type): Likewise.

gcc/testsuite/ChangeLog:

	* rust/compile/nr2/exclude: Remove entries.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>