Use the correct cast kinds for bit casts and function to pointer decay. Fixes PR4827.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80720 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp
index f3a841d..4496c53 100644
--- a/lib/CodeGen/CGExprScalar.cpp
+++ b/lib/CodeGen/CGExprScalar.cpp
@@ -627,6 +627,10 @@
   switch (Kind) {
   default:
     break;
+  case CastExpr::CK_BitCast: {
+    Value *Src = Visit(const_cast<Expr*>(E));
+    return Builder.CreateBitCast(Src, ConvertType(DestTy));
+  }
   case CastExpr::CK_ArrayToPointerDecay: {
     assert(E->getType()->isArrayType() &&
            "Array to pointer decay must have array source type!");