Update for LLVM API change.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77492 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGObjC.cpp b/lib/CodeGen/CGObjC.cpp
index 6773792..1bf07bf 100644
--- a/lib/CodeGen/CGObjC.cpp
+++ b/lib/CodeGen/CGObjC.cpp
@@ -28,7 +28,7 @@
 {
   llvm::Constant *C = CGM.getObjCRuntime().GenerateConstantString(E);
   // FIXME: This bitcast should just be made an invariant on the Runtime.
-  return VMContext.getConstantExprBitCast(C, ConvertType(E->getType()));
+  return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
 }
 
 /// Emit a selector.