sse.md (VIMAX_AVX2): Change V4DI to V2TI.

sse.md (VIMAX_AVX2): Change V4DI to V2TI.

	* config/i386/sse.md (VIMAX_AVX2): Change V4DI to V2TI.
	(sse2_avx, sseinsnmode): Add V2TI.
	(REDUC_SMINMAX_MODE): New mode iterator.
	(reduc_smax_v4sf, reduc_smin_v4sf, reduc_smax_v8sf,
	reduc_smin_v8sf, reduc_smax_v4df, reduc_smin_v4df): Remove.
	(reduc_<code>_<mode>): New smaxmin and umaxmin expanders.
	(sse2_lshrv1ti3): Rename to...
	(<sse2_avx2>_lshr<mode>3): ... this.  Use VIMAX_AVX2 mode
	iterator.  Move before umaxmin expanders.
	* config/i386/i386.h (VALID_AVX256_REG_MODE,
	SSE_REG_MODE_P): Accept V2TImode.
	* config/i386/i386.c (ix86_expand_reduc): Handle V32QImode,
	V16HImode, V8SImode and V4DImode.

From-SVN: r178930