AVX512FP16: Add vrcpph/vrcpsh/vscalefph/vscalefsh.

AVX512FP16: Add vrcpph/vrcpsh/vscalefph/vscalefsh.

gcc/ChangeLog:

	* config/i386/avx512fp16intrin.h: (_mm512_rcp_ph):
	New intrinsic.
	(_mm512_mask_rcp_ph): Likewise.
	(_mm512_maskz_rcp_ph): Likewise.
	(_mm_rcp_sh): Likewise.
	(_mm_mask_rcp_sh): Likewise.
	(_mm_maskz_rcp_sh): Likewise.
	(_mm512_scalef_ph): Likewise.
	(_mm512_mask_scalef_ph): Likewise.
	(_mm512_maskz_scalef_ph): Likewise.
	(_mm512_scalef_round_ph): Likewise.
	(_mm512_mask_scalef_round_ph): Likewise.
	(_mm512_maskz_scalef_round_ph): Likewise.
	(_mm_scalef_sh): Likewise.
	(_mm_mask_scalef_sh): Likewise.
	(_mm_maskz_scalef_sh): Likewise.
	(_mm_scalef_round_sh): Likewise.
	(_mm_mask_scalef_round_sh): Likewise.
	(_mm_maskz_scalef_round_sh): Likewise.
	* config/i386/avx512fp16vlintrin.h (_mm_rcp_ph):
	New intrinsic.
	(_mm256_rcp_ph): Likewise.
	(_mm_mask_rcp_ph): Likewise.
	(_mm256_mask_rcp_ph): Likewise.
	(_mm_maskz_rcp_ph): Likewise.
	(_mm256_maskz_rcp_ph): Likewise.
	(_mm_scalef_ph): Likewise.
	(_mm256_scalef_ph): Likewise.
	(_mm_mask_scalef_ph): Likewise.
	(_mm256_mask_scalef_ph): Likewise.
	(_mm_maskz_scalef_ph): Likewise.
	(_mm256_maskz_scalef_ph): Likewise.
	* config/i386/i386-builtin.def: Add new builtins.
	* config/i386/sse.md (VFH_AVX512VL): New.
	(avx512fp16_rcp<mode>2<mask_name>): Ditto.
	(avx512fp16_vmrcpv8hf2<mask_scalar_name>): Ditto.
	(avx512f_vmscalef<mode><mask_scalar_name><round_scalar_name>):
	Adjust to support HF vector modes.
	(<avx512>_scalef<mode><mask_name><round_name>): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx-1.c: Add test for new builtins.
	* gcc.target/i386/sse-13.c: Ditto.
	* gcc.target/i386/sse-23.c: Ditto.
	* gcc.target/i386/sse-14.c: Add test for new intrinsics.
	* gcc.target/i386/sse-22.c: Ditto.