aarch64: Add sve_type to SVE builtins code

aarch64: Add sve_type to SVE builtins code

Until now, the SVE ACLE code had mostly been able to represent
individual SVE arguments with just an element type suffix (s32, u32,
etc.).  However, the SME2 ACLE provides many overloaded intrinsics
that operate on tuples rather than single vectors.  This patch
therefore adds a new type (sve_type) that combines an element
type suffix with a vector count.  This is enough to uniquely
represent all SVE ACLE types.

gcc/
	* config/aarch64/aarch64-sve-builtins.h (sve_type): New struct.
	(sve_type::operator==): New function.
	(function_resolver::get_vector_type): Delete.
	(function_resolver::report_no_such_form): Take an sve_type rather
	than a type_suffix_index.
	* config/aarch64/aarch64-sve-builtins.cc (get_vector_type): New
	function.
	(function_resolver::get_vector_type): Delete.
	(function_resolver::report_no_such_form): Take an sve_type rather
	than a type_suffix_index.
	(find_sve_type): New function, split out from...
	(function_resolver::infer_vector_or_tuple_type): ...here.