am f8e31660: am 8b115448: Merge "AArch64: Add memcmp16() for Arm64; ensure xSELF not clobbered"

* commit 'f8e31660ca69ed81a0bb9467be130d6c016a8dc6':
  AArch64: Add memcmp16() for Arm64; ensure xSELF not clobbered