Add a CK_FunctionToPointerDecay cast kind.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80719 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 3593826..0dc4b8d 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -1016,7 +1016,7 @@
       FromType = From->getType();
     }
     FromType = Context.getPointerType(FromType);
-    ImpCastExprToType(From, FromType);
+    ImpCastExprToType(From, FromType, CastExpr::CK_FunctionToPointerDecay);
     break;
 
   default: