Enable VBMI2 support [3/7]

Enable VBMI2 support [3/7]

gcc/
	config/i386/avx512vbmi2intrin.h (_mm512_mask_expand_epi8,
	_mm512_maskz_expand_epi8, _mm512_mask_expandloadu_epi8,
	_mm512_maskz_expandloadu_epi8, _mm512_mask_expand_epi16,
	_mm512_maskz_expand_epi16, _mm512_mask_expandloadu_epi16,
	_mm512_maskz_expandloadu_epi16): New intrinsics.
	config/i386/avx512vbmi2vlintrin.h (_mm_mask_expand_epi8,
	_mm_maskz_expand_epi8, _mm_mask_expandloadu_epi8,
	_mm_maskz_expandloadu_epi8, _mm_mask_expand_epi16,
	_mm_maskz_expand_epi16, _mm_mask_expandloadu_epi16,
	_mm_maskz_expandloadu_epi16, _mm256_mask_expand_epi16,
	_mm256_maskz_expand_epi16, _mm256_mask_expandloadu_epi16,
	_mm256_maskz_expandloadu_epi16, _mm256_mask_expand_epi8,
	_mm256_maskz_expand_epi8, _mm256_mask_expandloadu_epi8,
	_mm256_maskz_expandloadu_epi8): New intrinsics.
	config/i386/i386-builtin-types.def (V64QI_FTYPE_PCV64QI_V64QI_UDI,
	V32HI_FTYPE_PCV32HI_V32HI_USI, V32QI_FTYPE_PCV32QI_V32QI_USI,
	V16HI_FTYPE_PCV16HI_V16HI_UHI, V16QI_FTYPE_PCV16QI_V16QI_UHI,
	V8HI_FTYPE_PCV8HI_V8HI_UQI): New types.
	config/i386/i386.c (ix86_expand_special_args_builtin): Use new types.
	config/i386/sse.md (VI248_VLBW): New iterator.
	(expand<mode>_mask, expand<mode>_maskz): New patterns.

gcc/testsuite/
	gcc.target/i386/avx512f-vpexpandb-1.c: New test.
	gcc.target/i386/avx512f-vpexpandb-2.c: Ditto.
	gcc.target/i386/avx512f-vpexpandw-1.c: Ditto.
	gcc.target/i386/avx512f-vpexpandw-2.c: Ditto.
	gcc.target/i386/avx512vl-vpexpandb-1.c: Ditto.
	gcc.target/i386/avx512vl-vpexpandb-2.c: Ditto.
	gcc.target/i386/avx512vl-vpexpandw-1.c: Ditto.
	gcc.target/i386/avx512vl-vpexpandw-2.c: Ditto.

From-SVN: r255121