Rollback one from Testing change for failing unit test

src/ia32/debug-ia32.cc

 // 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 247 matching lines @@
 // several frames above.
 // There is no calling conventions here, because it never actually gets called,
 // it only gets returned to.
 // Frame structure (conforms InternalFrame structure):
 //   -- JSFunction
 //   -- code
 //   -- SMI maker
 //   -- context
 //   -- frame base
 void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
-  // Temporary disabled for failing test investigation.
-  //ExternalReference restarter_frame_function_slot =
-  //    ExternalReference(Debug_Address::RestarterFrameFunctionPointer());
-  //__ mov(Operand::StaticVariable(restarter_frame_function_slot), Immediate(0));
+  ExternalReference restarter_frame_function_slot =
+      ExternalReference(Debug_Address::RestarterFrameFunctionPointer());
+  __ mov(Operand::StaticVariable(restarter_frame_function_slot), Immediate(0));
 
   // We do not know our frame height, but set esp based on ebp.
   __ lea(esp, Operand(ebp, -4 * kPointerSize));
 
   __ pop(edi);  // function
 
   // Skip code self-reference and marker.
   __ add(Operand(esp), Immediate(2 * kPointerSize));
 
   __ pop(esi);  // Context.
@@ skipping 28 matching lines @@
 }
 
 const int Debug::kFrameDropperFrameSize = 5;
 
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32