am 7a7dd4da: am 95072ae7: am 2b689e37: Merge "Revert "Revert "Revert "Revert "[optimizing] Improve x86 shifts"""""

* commit '7a7dd4daecb62a15bfe02d1ba9e676b277fee594':
  Revert "Revert "Revert "Revert "[optimizing] Improve x86 shifts""""