Merge pull request #133 from jethrogb/rust-bug-56942

Cherry pick bug fix

Author: alexcrichton

lib/Target/X86/X86TargetTransformInfo.cpp

@@ -874,7 +874,7 @@ int X86TTIImpl::getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index,
 
   // Subvector extractions are free if they start at beginning of the
   // vector.
-  if (Kind == TTI::SK_ExtractSubvector &&
+  if (Kind == TTI::SK_ExtractSubvector && LT.second.isVector() &&
       ((Index % LT.second.getVectorNumElements()) == 0))
     return 0;