Introduce DisallowDeoptimization scope.

src/objects-inl.h

 // Copyright 2012 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 4661 matching lines @@
 
 bool Code::marked_for_deoptimization() {
   ASSERT(kind() == OPTIMIZED_FUNCTION);
   return MarkedForDeoptimizationField::decode(
       READ_UINT32_FIELD(this, kKindSpecificFlags1Offset));
 }
 
 
 void Code::set_marked_for_deoptimization(bool flag) {
   ASSERT(kind() == OPTIMIZED_FUNCTION);
+  ASSERT(!flag || AllowDeoptimization::IsAllowed(GetIsolate()));
   int previous = READ_UINT32_FIELD(this, kKindSpecificFlags1Offset);
   int updated = MarkedForDeoptimizationField::update(previous, flag);
   WRITE_UINT32_FIELD(this, kKindSpecificFlags1Offset, updated);
 }
 
 
 bool Code::is_weak_stub() {
   return CanBeWeakStub() && WeakStubField::decode(
       READ_UINT32_FIELD(this, kKindSpecificFlags1Offset));
 }
@@ skipping 2343 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_