i386.md (isa): Add x64_sse4 member.

i386.md (isa): Add x64_sse4 member.

	* config/i386/i386.md (isa): Add x64_sse4 member.
	(enabled): Handle x64_sse4.
	(*movdi_internal): Add *x->?r alternative to emit pextrq $0,%xmm,%reg
	instruction for 64bit SSE4_1 targets.  Update insn attributes.
	(*movsi_internal): Add *x->?r alternative to emit pextrd $0,%xmm,%reg
	instruction for SSE4_1 targets.  Update insn attributes.
	* config/i386/sse.md (*vec_extract<ssevecmodelower>_0): Merge
	with *sse4_1_pextrd and *sse4_1_pextrq having const_0 selector.
	(*vec_extractv2di_1): Merge with *sse4_1_pextrq having
	const_1 selector.
	(*vec_extractv4si): Rename from *sse4_1_pextrd.
	(*vec_extractv4si_zext): Rename from *sse4_1_pextrd_zext.
	(*vec_extract<ssevecmodelower>_0 splitters): Merge splitters together.

From-SVN: r198643