MFC r265231:

MFC	r265231:

gcc: fix strict alignment.

From the OpenBSD log:

x86-64 ABI requires arrays greater than 16 bytes to be aligned to
16byte boundary.  However, GCC 16-byte aligns arrays of >=16 BITS,
not BYTES.

This diff improves bug detectability for code which has local arrays
of [16 .. 127] bits:  in those cases SSP will now detect even 1-byte
overflows.

Obtained from:	OpenBSD (CVS rev 1.4)

git-svn-id: svn://svn.freebsd.org/base/stable/10@265728 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f