Patch for code gen. for c-style cast which ends in
using class's conversion functions [12.3.2-p2]

llvm-svn: 80433
diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
index 299296a..f3a841d 100644
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -228,8 +228,11 @@
   }
   Value *VisitCastExpr(const CastExpr *E) {
     if (E->getCastKind() == CastExpr::CK_UserDefinedConversion) {
-      const CXXFunctionalCastExpr *CXXFExpr = cast<CXXFunctionalCastExpr>(E);
-      return CGF.EmitCXXFunctionalCastExpr(CXXFExpr).getScalarVal();
+      if (const CXXFunctionalCastExpr *CXXFExpr = 
+            dyn_cast<CXXFunctionalCastExpr>(E))
+        return CGF.EmitCXXFunctionalCastExpr(CXXFExpr).getScalarVal();
+      assert(isa<CStyleCastExpr>(E) && 
+             "VisitCastExpr - missing CStyleCastExpr");
     }
       
     // Make sure to evaluate VLA bounds now so that we have them for later.