[PATCH] [2/2] Add PRFCHW feature to a few AMD processors

[Craig Topper]

  Probably also need to check for hasPRFTCHW here

    if (Subtarget->hasSSE1())
      setOperationAction(ISD::PREFETCH      , MVT::Other, Legal);

http://llvm-reviews.chandlerc.com/D1934