Eager expansion for include* #1805 #1865

Eager expansion for include* #1805 #1865

gcc/rust/ChangeLog:

	* expand/rust-expand-visitor.h:
	remove auto keyword
	* expand/rust-macro-builtins-helpers.cc:
	allow for changing macro invoc types on eager expansions to
	semicoloned macros
	* expand/rust-macro-builtins-helpers.h:
	add default semicoloned argument
	* expand/rust-macro-builtins-include.cc:
	allow for eager expansion for include and include_bytes
	allow for parsing include invocations as items instead of
	expressions, which allows invocations at global scope
	* expand/rust-macro-expand.cc:
	push Expr type for eager invocations

gcc/testsuite/ChangeLog:

	* rust/compile/macros/builtin/include1.rs:
	add basic include test at global scope
	* rust/compile/macros/builtin/include2.rs:
	add basic include test at local scope with expression
	* rust/compile/macros/builtin/include3.rs:
	add eager expansion test at global scope
	* rust/compile/macros/builtin/include4.rs:
	add eager expansion test at local scope with expression
	* rust/compile/macros/builtin/include_bytes.rs:
	add eager expansion test at global scope
	* rust/compile/macros/builtin/include_rs:
	supporting test file with dummy function
	* rust/compile/macros/builtin/include_rs2:
	supporting test file with dummy string
	* rust/compile/macros/builtin/include_str.rs:
	add eager expansion test at global scope
	* rust/execute/torture/builtin_macro_include_bytes.rs:
	clean up old test logic, add permutations for eager expansion
	* rust/execute/torture/builtin_macro_include_str.rs:
	add eager expansion permutations