Fix the ARM VLD3 (single 3-element structure to all lanes)

size 16 double-spaced registers instruction printing.

This:
	vld3.16 {d0[], d2[], d4[]}, [r4]!

was being printed as:

	vld3.16	{d0[], d1[], d2[]}, [r4]!

rdar://16531387

llvm-svn: 205779