i386.c (bdesc_args): Rename CODE_FOR_avx2_umulhrswv16hi3 to CODE_FOR_avx2_pmulhrswv16hi3.

i386.c (bdesc_args): Rename CODE_FOR_avx2_umulhrswv16hi3 to CODE_FOR_avx2_pmulhrswv16hi3.

	* config/i386/i386.c (bdesc_args): Rename CODE_FOR_avx2_umulhrswv16hi3 to
	CODE_FOR_avx2_pmulhrswv16hi3.
	* config/i386/predicates.md (const1_operand): Extend for vectors.
	* config/i386/sse.md (ssse3_avx2): Extend.
	(ssedoublemode): Ditto.
	(<sse2_avx2>_uavg<mode>3): Merge avx2_uavgv32qi3, sse2_uavgv16qi3,
	avx2_uavgv16hi3 and sse2_uavgv8hi3 into one.
	(*<sse2_avx2>_uavg<mode>3): Merge *avx2_uavgv32qi3, *sse2_uavgv16qi3,
	*avx2_uavgv16hi3 and *sse2_uavgv8hi3 into one.
	(PMULHRSW): New.
	(<ssse3_avx2>_pmulhrsw<mode>3): Merge avx2_umulhrswv16hi3,
	ssse3_pmulhrswv8hi3 and ssse3_pmulhrswv4hi3 into one.
	(*avx2_pmulhrswv16hi3): Replace const_vector with const1_operand
	predicate.
	(*ssse3_pmulhrswv8hi3): Ditto.
	(*ssse3_pmulhrswv4hi3): Ditto.

From-SVN: r193208