sse.md (avx2_gathersi<mode>, [...]): Add clobber of match_scratch...

	* config/i386/sse.md (avx2_gathersi<mode>,
	avx2_gatherdi<mode>, avx2_gatherdi<mode>256): Add clobber of
	match_scratch, change memory_operand to register_operand,
	add (mem:BLK (scratch)) use.
	(*avx2_gathersi<mode>, *avx2_gatherdi<mode>,
	*avx2_gatherdi<mode>256): Add clobber of match_scratch,
	add earlyclobber to the output operand and match_scratch,
	add (mem:BLK (scratch)) use, change the other mem to match_operand.
	Use %p6 instead of %c6 in the pattern.
	* config/i386/i386.c (ix86_expand_builtin): Adjust for
	operand 2 being a Pmode register_operand instead of memory_operand.

From-SVN: r179869