Upgrade arm-optimized-routines to 6b594432c8ac46e71686ea21fad30d1c3f79e65a am: cd7d536620 am: 7566a76b31 am: 03b194a66b
am: 1ad51cf985

Change-Id: Ia7f6edef8632e9ef7678784ec34df3eea0523751