Don't try to use "OkayToDiscard" to mean BOTH this plan is a user plan or not AND unwind on error.

rdar://problem/11419156


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@156627 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/source/Expression/ClangFunction.cpp b/source/Expression/ClangFunction.cpp
index a6344f9..d75f5eb 100644
--- a/source/Expression/ClangFunction.cpp
+++ b/source/Expression/ClangFunction.cpp
@@ -410,6 +410,8 @@
                                                        discard_on_error,
                                                        this_arg,
                                                        cmd_arg);
+    new_plan->SetIsMasterPlan(true);
+    new_plan->SetOkayToDiscard (false);
     return new_plan;
 }