Disable zmm register and 512 bit libmvec call when !TARGET_EVEX512

Disable zmm register and 512 bit libmvec call when !TARGET_EVEX512

gcc/ChangeLog:

	* config/i386/i386-expand.cc (ix86_broadcast_from_constant):
	Disable zmm broadcast for !TARGET_EVEX512.
	* config/i386/i386-options.cc (ix86_option_override_internal):
	Do not use PVW_512 when no-evex512.
	(ix86_simd_clone_adjust): Add evex512 target into string.
	* config/i386/i386.cc (type_natural_mode): Report ABI warning
	when using zmm register w/o evex512.
	(ix86_return_in_memory): Do not allow zmm when !TARGET_EVEX512.
	(ix86_hard_regno_mode_ok): Ditto.
	(ix86_set_reg_reg_cost): Ditto.
	(ix86_rtx_costs): Ditto.
	(ix86_vector_mode_supported_p): Ditto.
	(ix86_preferred_simd_mode): Ditto.
	(ix86_get_mask_mode): Ditto.
	(ix86_simd_clone_compute_vecsize_and_simdlen): Disable 512 bit
	libmvec call when !TARGET_EVEX512.
	(ix86_simd_clone_usable): Ditto.
	* config/i386/i386.h (BIGGEST_ALIGNMENT): Disable 512 alignment
	when !TARGET_EVEX512
	(MOVE_MAX): Do not use PVW_512 when !TARGET_EVEX512.
	(STORE_MAX_PIECES): Ditto.