Fail early when re-entering code that has been patched for lazy deopt

src/a64/deoptimizer-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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@@ skipping 32 matching lines @@
   return 4 * kInstructionSize;
 }
 
 
 
 void Deoptimizer::PatchCodeForDeoptimization(Isolate* isolate, Code* code) {
   // Invalidate the relocation information, as it will become invalid by the
   // code patching below, and is not needed any more.
   code->InvalidateRelocation();
 
+  // TODO(jkummerow): if (FLAG_zap_code_space), make the code object's
+  // entry sequence unusable (see other architectures).
+
   // For each LLazyBailout instruction insert a call to the corresponding
   // deoptimization entry.
   DeoptimizationInputData* deopt_data =
       DeoptimizationInputData::cast(code->deoptimization_data());
   Address code_start_address = code->instruction_start();
 #ifdef DEBUG
   Address prev_call_address = NULL;
 #endif
 
   for (int i = 0; i < deopt_data->DeoptCount(); i++) {
@@ skipping 304 matching lines @@
 
 
 void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) {
   SetFrameSlot(offset, value);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal