AVX512FP16: Add vcvtph2pd/vcvtph2psx/vcvtpd2ph/vcvtps2phx.

AVX512FP16: Add vcvtph2pd/vcvtph2psx/vcvtpd2ph/vcvtps2phx.

gcc/ChangeLog:

	* config/i386/avx512fp16intrin.h (_mm512_cvtph_pd):
	New intrinsic.
	(_mm512_mask_cvtph_pd): Likewise.
	(_mm512_maskz_cvtph_pd): Likewise.
	(_mm512_cvt_roundph_pd): Likewise.
	(_mm512_mask_cvt_roundph_pd): Likewise.
	(_mm512_maskz_cvt_roundph_pd): Likewise.
	(_mm512_cvtxph_ps): Likewise.
	(_mm512_mask_cvtxph_ps): Likewise.
	(_mm512_maskz_cvtxph_ps): Likewise.
	(_mm512_cvtx_roundph_ps): Likewise.
	(_mm512_mask_cvtx_roundph_ps): Likewise.
	(_mm512_maskz_cvtx_roundph_ps): Likewise.
	(_mm512_cvtxps_ph): Likewise.
	(_mm512_mask_cvtxps_ph): Likewise.
	(_mm512_maskz_cvtxps_ph): Likewise.
	(_mm512_cvtx_roundps_ph): Likewise.
	(_mm512_mask_cvtx_roundps_ph): Likewise.
	(_mm512_maskz_cvtx_roundps_ph): Likewise.
	(_mm512_cvtpd_ph): Likewise.
	(_mm512_mask_cvtpd_ph): Likewise.
	(_mm512_maskz_cvtpd_ph): Likewise.
	(_mm512_cvt_roundpd_ph): Likewise.
	(_mm512_mask_cvt_roundpd_ph): Likewise.
	(_mm512_maskz_cvt_roundpd_ph): Likewise.
	* config/i386/avx512fp16vlintrin.h (_mm_cvtph_pd):
	New intrinsic.
	(_mm_mask_cvtph_pd): Likewise.
	(_mm_maskz_cvtph_pd): Likewise.
	(_mm256_cvtph_pd): Likewise.
	(_mm256_mask_cvtph_pd): Likewise.
	(_mm256_maskz_cvtph_pd): Likewise.
	(_mm_cvtxph_ps): Likewise.
	(_mm_mask_cvtxph_ps): Likewise.
	(_mm_maskz_cvtxph_ps): Likewise.
	(_mm256_cvtxph_ps): Likewise.
	(_mm256_mask_cvtxph_ps): Likewise.
	(_mm256_maskz_cvtxph_ps): Likewise.
	(_mm_cvtxps_ph): Likewise.
	(_mm_mask_cvtxps_ph): Likewise.
	(_mm_maskz_cvtxps_ph): Likewise.
	(_mm256_cvtxps_ph): Likewise.
	(_mm256_mask_cvtxps_ph): Likewise.
	(_mm256_maskz_cvtxps_ph): Likewise.
	(_mm_cvtpd_ph): Likewise.
	(_mm_mask_cvtpd_ph): Likewise.
	(_mm_maskz_cvtpd_ph): Likewise.
	(_mm256_cvtpd_ph): Likewise.
	(_mm256_mask_cvtpd_ph): Likewise.
	(_mm256_maskz_cvtpd_ph): Likewise.
	* config/i386/i386-builtin.def: Add corresponding new builtins.
	* config/i386/i386-builtin-types.def: Add corresponding builtin types.
	* config/i386/i386-expand.c: Handle new builtin types.
	* config/i386/sse.md
	(VF4_128_8_256): New.
	(VF48H_AVX512VL): Ditto.
	(ssePHmode): Add HF vector modes.
	(castmode): Add new convertable modes.
	(qq2phsuff): Ditto.
	(ph2pssuffix): New.
	(avx512fp16_vcvt<castmode>2ph_<mode><mask_name><round_name>): Ditto.
	(avx512fp16_vcvt<castmode>2ph_<mode>): Ditto.
	(*avx512fp16_vcvt<castmode>2ph_<mode>): Ditto.
	(avx512fp16_vcvt<castmode>2ph_<mode>_mask): Ditto.
	(*avx512fp16_vcvt<castmode>2ph_<mode>_mask): Ditto.
	(*avx512fp16_vcvt<castmode>2ph_<mode>_mask_1): Ditto.
	(avx512fp16_float_extend_ph<mode>2<mask_name><round_saeonly_name>):
	Ditto.
	(avx512fp16_float_extend_ph<mode>2<mask_name>): Ditto.
	(*avx512fp16_float_extend_ph<mode>2_load<mask_name>): Ditto.
	(avx512fp16_float_extend_phv2df2<mask_name>): Ditto.
	(*avx512fp16_float_extend_phv2df2_load<mask_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.