Upgrade arm-optimized-routines to ef907c7a799ae7fd8662fb56a6c5e9437508f645 am: 709efce901 am: 1a4a74f2a1 am: 61e0c271a5 am: bf39f425d6

Original change: undetermined

Change-Id: I7104c6f39e901aaf16a6b7bf2175051f2dec183f