arm: [MVE intrinsics] add support for tuples

arm: [MVE intrinsics] add support for tuples

This patch is largely a copy/paste from the aarch64 SVE counterpart,
and adds support for tuples to the MVE intrinsics framework.

Introduce function_resolver::infer_tuple_type which will be used to
resolve overloaded vst2q and vst4q function names in a later patch.

Fix access to acle_vector_types in a few places, as well as in
infer_vector_or_tuple_type because we should shift the tuple size to
the right by one bit when computing the array index.

The new wrap_type_in_struct, register_type_decl and infer_tuple_type
are largely copies of the aarch64 versions, and
register_builtin_tuple_types is very similar.

gcc/ChangeLog:

	* config/arm/arm-mve-builtins-shapes.cc (parse_type): Fix access
	to acle_vector_types.
	* config/arm/arm-mve-builtins.cc (wrap_type_in_struct): New.
	(register_type_decl): New.
	(register_builtin_tuple_types): Fix support for tuples.
	(function_resolver::infer_tuple_type): New.
	* config/arm/arm-mve-builtins.h
	(function_resolver::infer_tuple_type): Declare.
	(function_instance::tuple_type): Fix access to acle_vector_types.