Check that function being patched has no activations on any thread stack

src/liveedit.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 72 matching lines @@
   static void WrapSharedFunctionInfos(Handle<JSArray> array);
 
   static void ReplaceFunctionCode(Handle<JSArray> new_compile_info_array,
                                   Handle<JSArray> shared_info_array);
 
   static void RelinkFunctionToScript(Handle<JSArray> shared_info_array,
                                      Handle<Script> script_handle);
 
   static void PatchFunctionPositions(Handle<JSArray> shared_info_array,
                                      Handle<JSArray> position_change_array);
+
+  // A copy of this is in liveedit-delay.js.
+  enum FunctionPatchabilityStatus {
+    FUNCTION_AVAILABLE_FOR_PATCH = 0,
+    FUNCTION_BLOCKED_ON_STACK = 1
+  };
 };
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 } }  // namespace v8::internal
 
 #endif /* V*_LIVEEDIT_H_ */