Fix modules with same name as builtins causing ICE (#3315)

Fix modules with same name as builtins causing ICE (#3315)

gcc/rust/ChangeLog:

	* resolve/rust-forever-stack.h (ForeverStack): Add a dedicated prelude node for
	the Language prelude
	* resolve/rust-forever-stack.hxx (ForeverStack): Add support code for the
	prelude node
	* resolve/rust-late-name-resolver-2.0.cc (Late::visit): Move
	language prelude builtins to the prelude context
	* resolve/rust-name-resolution-context.cc
	(NameResolutionContext::scoped): Add code for handling
	the prelude corner case
	* resolve/rust-rib.h (Rib::Kind): Add a special Prelude rib type

gcc/testsuite/ChangeLog:

	* rust/compile/issue-3315-1.rs: Add test for module with same name
	as builtin
	* rust/compile/issue-3315-2.rs: Test with utilization of i32
	type
	* rust/compile/nr2/exclude: issue-3315-2.rs Does not work with
	NR2.0

Signed-off-by: Liam Naddell <liamnprg@gmail.com>