fix http://llvm.org/bugs/show_bug.cgi?id=2097

llvm-svn: 47615
diff --git a/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp b/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp
index 15ccbbd..d8b82b3 100644
--- a/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/llvm/lib/Transforms/Scalar/CodeGenPrepare.cpp
@@ -991,7 +991,7 @@
     return false;
 
   // Only do this xform if truncating is free.
-  if (!TLI->isTruncateFree(I->getType(), Src->getType()))
+  if (TLI && !TLI->isTruncateFree(I->getType(), Src->getType()))
     return false;
 
   // Only safe to perform the optimization if the source is also defined in