In C++ keep unavailable function calls in the AST, like in C/ObjC.

This allows the migrator to visit and fix them.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143699 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ARCMigrate/TransGCCalls.cpp b/lib/ARCMigrate/TransGCCalls.cpp
index 71dc6dc..9c3faae 100644
--- a/lib/ARCMigrate/TransGCCalls.cpp
+++ b/lib/ARCMigrate/TransGCCalls.cpp
@@ -40,6 +40,7 @@
           Transaction Trans(TA);
           TA.clearDiagnostic(diag::err_unavailable,
                              diag::err_unavailable_message,
+                             diag::err_ovl_deleted_call, // ObjC++
                              DRE->getSourceRange());
           TA.replace(DRE->getSourceRange(), "CFBridgingRelease");
         }