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

* commit '95072ae7446ceaa080c71a7296d98a17325539d8':
  Revert "Revert "Revert "Revert "[optimizing] Improve x86 shifts""""