AVX512FP16: Add vaddph/vsubph/vdivph/vmulph.

AVX512FP16: Add vaddph/vsubph/vdivph/vmulph.

gcc/ChangeLog:

	* config.gcc: Add avx512fp16vlintrin.h.
	* config/i386/avx512fp16intrin.h: (_mm512_add_ph): New intrinsic.
	(_mm512_mask_add_ph): Likewise.
	(_mm512_maskz_add_ph): Likewise.
	(_mm512_sub_ph): Likewise.
	(_mm512_mask_sub_ph): Likewise.
	(_mm512_maskz_sub_ph): Likewise.
	(_mm512_mul_ph): Likewise.
	(_mm512_mask_mul_ph): Likewise.
	(_mm512_maskz_mul_ph): Likewise.
	(_mm512_div_ph): Likewise.
	(_mm512_mask_div_ph): Likewise.
	(_mm512_maskz_div_ph): Likewise.
	(_mm512_add_round_ph): Likewise.
	(_mm512_mask_add_round_ph): Likewise.
	(_mm512_maskz_add_round_ph): Likewise.
	(_mm512_sub_round_ph): Likewise.
	(_mm512_mask_sub_round_ph): Likewise.
	(_mm512_maskz_sub_round_ph): Likewise.
	(_mm512_mul_round_ph): Likewise.
	(_mm512_mask_mul_round_ph): Likewise.
	(_mm512_maskz_mul_round_ph): Likewise.
	(_mm512_div_round_ph): Likewise.
	(_mm512_mask_div_round_ph): Likewise.
	(_mm512_maskz_div_round_ph): Likewise.
	* config/i386/avx512fp16vlintrin.h: New header.
	* config/i386/i386-builtin-types.def (V16HF, V8HF, V32HF):
	Add new builtin types.
	* config/i386/i386-builtin.def: Add corresponding builtins.
	* config/i386/i386-expand.c
	(ix86_expand_args_builtin): Handle new builtin types.
	(ix86_expand_round_builtin): Likewise.
	* config/i386/immintrin.h: Include avx512fp16vlintrin.h
	* config/i386/sse.md (VFH): New mode_iterator.
	(VF2H): Likewise.
	(avx512fmaskmode): Add HF vector modes.
	(avx512fmaskhalfmode): Likewise.
	(<plusminus_insn><mode>3<mask_name><round_name>): Adjust to for
	HF vector modes.
	(*<plusminus_insn><mode>3<mask_name><round_name>): Likewise.
	(mul<mode>3<mask_name><round_name>): Likewise.
	(*mul<mode>3<mask_name><round_name>): Likewise.
	(div<mode>3): Likewise.
	(<sse>_div<mode>3<mask_name><round_name>): Likewise.
	* config/i386/subst.md (SUBST_V): Add HF vector modes.
	(SUBST_A): Likewise.
	(round_mode512bit_condition): Adjust for V32HFmode.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/avx-1.c: Add -mavx512vl and test for new intrinsics.
	* gcc.target/i386/avx-2.c: Add -mavx512vl.
	* gcc.target/i386/avx512fp16-11a.c: New test.
	* gcc.target/i386/avx512fp16-11b.c: Ditto.
	* gcc.target/i386/avx512vlfp16-11a.c: Ditto.
	* gcc.target/i386/avx512vlfp16-11b.c: Ditto.
	* gcc.target/i386/sse-13.c: Add test for new builtins.
	* 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.