* config/i386/i386.h (enum reg_class): Rename MASK_REGS to
	ALL_MASK_REGS and MASK_EVEX_REGS to MASK_REGS.
	(MASK_CLASS_P): Update for rename.
	(MAYBE_MASK_CLASS_P): Ditto.
	(REG_CLASS_NAMES): Update.
	(REG_CLASS_CONTENT): Update.
	* config/i386/i386.c (regclass_map): Update for MASK_REG
	and ALL_MASK_REGS rename.
	* config/i386/constraints.md (Yk): Update for rename.
	(k): Ditto.

	* config/i386/i386.h (enum reg_class): Remove
	EVEX_SSE_REGS and MOD4_SSE_REGS.
	(REG_CLASS_NAMES): Update.
	(REG_CLASS_CONTENT): Update.
	* config/i386/i386.c (regclass_map): Declare AVX-512 SSE
	registers as ALL_SSE_REGS.
	(ix86_additional_allocno_class_p): Remove.
	(TARGET_ADDITIONAL_ALLOCNO_CLASS_P): Remove.
	(ix86_register_priority): Lower priority of EVEX SSE registers.
	Use IN_RANGE macro where appropriate.
	(ix86_hard_regno_mode_ok): Merge AVX-5124FMAPS and
	AVX-5124VNNIW checks.
	(ix86_modes_tieable_p): Tie 512-bit SSE modes.
	* config/i386/sse.md (avx5124fmaddps_4fmaddps)
	(avx5124fmaddps_4fmaddps_mask, avx5124fmaddps_4fmaddps_maskz)
	(avx5124fmaddps_4fmaddss, avx5124fmaddps_4fmaddss_mask)
	(avx5124fmaddps_4fmaddss_maskz, avx5124fmaddps_4fnmaddps)
	(avx5124fmaddps_4fnmaddps_mask, avx5124fmaddps_4fnmaddps_maskz)
	(avx5124fmaddps_4fnmaddss, avx5124fmaddps_4fnmaddss_mask)
	(avx5124fmaddps_4fnmaddss_maskz, avx5124vnniw_vp4dpwssd)
	(avx5124vnniw_vp4dpwssd_mask, avx5124vnniw_vp4dpwssd_maskz)
	(avx5124vnniw_vp4dpwssds, avx5124vnniw_vp4dpwssds_mask)
	(avx5124vnniw_vp4dpwssds_maskz): Use "v" instead of "Yh" constraint.
	* config/i386/constraints.md (Yh): Remove.

	* config/i386/i386.c (regclass_map): Declare integer REX registers
        as GENERAL_REGS.

From-SVN: r264516