Add gather/scatter tests with incorrect memory operand

2014-01-31  Michael Zolotukhin  <michael.v.zolotukhin@gmail.com>

	PR gas/16488
	* gas/i386/inval-avx512f.s: Add test for incorrect memory operand
	for gather/scatter instructions.
	* gas/i386/x86-64-inval-avx512f.s: Likewise.
	* gas/i386/inval-avx512f.l: Adjust correspondingly.
	* gas/i386/x86-64-inval-avx512f.l: Likewise.