gccrs: Split async and const function qualifiers

A function cannot be both async and const, however this should not be
handled in the parser but rather at a later stage in the compiler. This
commit change the AsyncConstStatus in the AST and the HIR to allows a
function to be both async and const.

gcc/rust/ChangeLog:

	* ast/rust-ast-builder.cc (AstBuilder::fn_qualifiers): Change
	constructor to match the new arguments.
	* ast/rust-ast-collector.cc (TokenCollector::visit): Change behavior
	to handle both const and async specifiers at the same time.
	* ast/rust-ast.cc (FunctionQualifiers::as_string): Likewise.
	* ast/rust-item.h (class FunctionQualifiers): Remove AsyncConstStatus
	and replace it with both Async and Const status. Also change the safety
	arguments to use an enum instead of a boolean.
	* hir/rust-ast-lower-base.cc (ASTLoweringBase::lower_qualifiers):
	Update constructor call.
	* hir/tree/rust-hir-item.h: Add Const and Async status, remove
	AsyncConstStatus, update the constructor.
	* hir/tree/rust-hir.cc (FunctionQualifiers::as_string): Update with
	the new status.
	* parse/rust-parse-impl.h (Parser::parse_function_qualifiers): Update
	constructor call.
	* util/rust-common.h (enum Mutability): Make an enum class.
	(enum class): Add Async and Const enum class to avoid booleans.
	(enum Unsafety): Change to an enum class.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

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