Enable VNNI support [4/5]

Enable VNNI support [4/5]

gcc/
	* config/i386/avx512vnniintrin.h (_mm512_dpwssd_epi32,
	_mm512_mask_dpwssd_epi32, _mm512_maskz_dpwssd_epi32): New intrinsics.
	* config/i386/avx512vnnivlintrin.h (_mm256_dpwssd_epi32,
	_mm256_mask_dpwssd_epi32, _mm256_maskz_dpwssd_epi32, _mm_dpwssd_epi32,
	_mm_mask_dpwssd_epi32, _mm_maskz_dpwssd_epi32): Ditto.

gcc/testsuite/
	* gcc.target/i386/avx512f-vnni-1.c: Add vdpwssd checks.
	* gcc.target/i386/avx512vl-vnni-1.c: Ditto.
	* gcc.target/i386/avx512f-vpdpwssd-2.c: New.
	* gcc.target/i386/avx512vl-vpdpwssd-2.c: Ditto.

From-SVN: r255496