gccrs: nr2.0: Handle global paths

gccrs: nr2.0: Handle global paths

gcc/rust/ChangeLog:

	* resolve/rust-forever-stack.h
	(ForeverStack::ForeverStack): Initialize extern_prelude.
	(ForeverStack::resolve_path): Add parameter
	has_opening_scope_resolution.
	(ForeverStack::extern_prelude): Add field.
	* resolve/rust-forever-stack.hxx: Include rust-edition.h.
	(ForeverStacl::resolve_path): Handle global paths (paths with an
	opening scope resolution operator).
	* resolve/rust-late-name-resolver-2.0.cc
	(Late::visit): Handle global paths.
	* resolve/rust-name-resolution-context.h
	(NameResolutionContext::resolve_path): Handle global paths.

gcc/testsuite/ChangeLog:

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

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