AVX512FP16: Add scalar fma instructions.

Add vfmadd[132,213,231]sh/vfnmadd[132,213,231]sh/
vfmsub[132,213,231]sh/vfnmsub[132,213,231]sh.

gcc/ChangeLog:

	* config/i386/avx512fp16intrin.h (_mm_fmadd_sh):
	New intrinsic.
	(_mm_mask_fmadd_sh): Likewise.
	(_mm_mask3_fmadd_sh): Likewise.
	(_mm_maskz_fmadd_sh): Likewise.
	(_mm_fmadd_round_sh): Likewise.
	(_mm_mask_fmadd_round_sh): Likewise.
	(_mm_mask3_fmadd_round_sh): Likewise.
	(_mm_maskz_fmadd_round_sh): Likewise.
	(_mm_fnmadd_sh): Likewise.
	(_mm_mask_fnmadd_sh): Likewise.
	(_mm_mask3_fnmadd_sh): Likewise.
	(_mm_maskz_fnmadd_sh): Likewise.
	(_mm_fnmadd_round_sh): Likewise.
	(_mm_mask_fnmadd_round_sh): Likewise.
	(_mm_mask3_fnmadd_round_sh): Likewise.
	(_mm_maskz_fnmadd_round_sh): Likewise.
	(_mm_fmsub_sh): Likewise.
	(_mm_mask_fmsub_sh): Likewise.
	(_mm_mask3_fmsub_sh): Likewise.
	(_mm_maskz_fmsub_sh): Likewise.
	(_mm_fmsub_round_sh): Likewise.
	(_mm_mask_fmsub_round_sh): Likewise.
	(_mm_mask3_fmsub_round_sh): Likewise.
	(_mm_maskz_fmsub_round_sh): Likewise.
	(_mm_fnmsub_sh): Likewise.
	(_mm_mask_fnmsub_sh): Likewise.
	(_mm_mask3_fnmsub_sh): Likewise.
	(_mm_maskz_fnmsub_sh): Likewise.
	(_mm_fnmsub_round_sh): Likewise.
	(_mm_mask_fnmsub_round_sh): Likewise.
	(_mm_mask3_fnmsub_round_sh): Likewise.
	(_mm_maskz_fnmsub_round_sh): Likewise.
	* config/i386/i386-builtin-types.def
	(V8HF_FTYPE_V8HF_V8HF_V8HF_UQI_INT): New builtin type.
	* config/i386/i386-builtin.def: Add new builtins.
	* config/i386/i386-expand.c: Handle new builtin type.
	* config/i386/sse.md (fmai_vmfmadd_<mode><round_name>):
	Ajdust to support FP16.
	(fmai_vmfmsub_<mode><round_name>): Ditto.
	(fmai_vmfnmadd_<mode><round_name>): Ditto.
	(fmai_vmfnmsub_<mode><round_name>): Ditto.
	(*fmai_fmadd_<mode>): Ditto.
	(*fmai_fmsub_<mode>): Ditto.
	(*fmai_fnmadd_<mode><round_name>): Ditto.
	(*fmai_fnmsub_<mode><round_name>): Ditto.
	(avx512f_vmfmadd_<mode>_mask<round_name>): Ditto.
	(avx512f_vmfmadd_<mode>_mask3<round_name>): Ditto.
	(avx512f_vmfmadd_<mode>_maskz<round_expand_name>): Ditto.
	(avx512f_vmfmadd_<mode>_maskz_1<round_name>): Ditto.
	(*avx512f_vmfmsub_<mode>_mask<round_name>): Ditto.
	(avx512f_vmfmsub_<mode>_mask3<round_name>): Ditto.
	(*avx512f_vmfmsub_<mode>_maskz_1<round_name>): Ditto.
	(*avx512f_vmfnmsub_<mode>_mask<round_name>): Ditto.
	(*avx512f_vmfnmsub_<mode>_mask3<round_name>): Ditto.
	(*avx512f_vmfnmsub_<mode>_mask<round_name>): Ditto.
	(*avx512f_vmfnmadd_<mode>_mask<round_name>): Renamed to ...
	(avx512f_vmfnmadd_<mode>_mask<round_name>) ... this, and
	adjust to support FP16.
	(avx512f_vmfnmadd_<mode>_mask3<round_name>): Ditto.
	(avx512f_vmfnmadd_<mode>_maskz_1<round_name>): Ditto.
	(avx512f_vmfnmadd_<mode>_maskz<round_expand_name>): New
	expander.

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.