Fix buffer overflow in avx256-unaligned-{load|store}-7.c

	Backported from mainline

	PR testsuite/63305
	* gcc.target/i386/avx256-unaligned-load-7.c (avx_test): Fix
	buffer overflow.
	* gcc.target/i386/avx256-unaligned-store-7.c (avx_test): Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_9-branch@217269 138bc75d-0d04-0410-961f-82ee72b054a4