Add a CastKind enum to CastExpr. Right now it's not used for much but it will be :)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77650 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index dc16dda..8ff2840 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -207,8 +207,9 @@
       return ExprError();
     exprs.release();
     return Owned(new (Context) CXXFunctionalCastExpr(Ty.getNonReferenceType(),
-                                                     Ty, TyBeginLoc, Exprs[0],
-                                                     RParenLoc));
+                                                     Ty, TyBeginLoc, 
+                                                     CastExpr::CK_Unknown, 
+                                                     Exprs[0], RParenLoc));
   }
 
   if (const RecordType *RT = Ty->getAs<RecordType>()) {