AVX512FP16: Add vcvtsh2si/vcvtsh2usi/vcvtsi2sh/vcvtusi2sh.

AVX512FP16: Add vcvtsh2si/vcvtsh2usi/vcvtsi2sh/vcvtusi2sh.

gcc/ChangeLog:

	* config/i386/avx512fp16intrin.h (_mm_cvtsh_i32): New intrinsic.
	(_mm_cvtsh_u32): Likewise.
	(_mm_cvt_roundsh_i32): Likewise.
	(_mm_cvt_roundsh_u32): Likewise.
	(_mm_cvtsh_i64): Likewise.
	(_mm_cvtsh_u64): Likewise.
	(_mm_cvt_roundsh_i64): Likewise.
	(_mm_cvt_roundsh_u64): Likewise.
	(_mm_cvti32_sh): Likewise.
	(_mm_cvtu32_sh): Likewise.
	(_mm_cvt_roundi32_sh): Likewise.
	(_mm_cvt_roundu32_sh): Likewise.
	(_mm_cvti64_sh): Likewise.
	(_mm_cvtu64_sh): Likewise.
	(_mm_cvt_roundi64_sh): Likewise.
	(_mm_cvt_roundu64_sh): Likewise.
	* config/i386/i386-builtin-types.def: Add corresponding builtin types.
	* config/i386/i386-builtin.def: Add corresponding new builtins.
	* config/i386/i386-expand.c (ix86_expand_round_builtin):
	Handle new builtin types.
	* config/i386/sse.md
	(avx512fp16_vcvtsh2<sseintconvertsignprefix>si<rex64namesuffix><round_name>):
	New define_insn.
	(avx512fp16_vcvtsh2<sseintconvertsignprefix>si<rex64namesuffix>_2): Likewise.
	(avx512fp16_vcvt<floatsuffix>si2sh<rex64namesuffix><round_name>): Likewise.

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.