Revert of Canonicalize handles for optimized compilation.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 716 matching lines @@
 }
 
 
 SealHandleScope::SealHandleScope(Isolate* isolate) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
 
   isolate_ = internal_isolate;
   i::HandleScopeData* current = internal_isolate->handle_scope_data();
   prev_limit_ = current->limit;
   current->limit = current->next;
-  prev_sealed_level_ = current->sealed_level;
-  current->sealed_level = current->level;
+  prev_level_ = current->level;
+  current->level = 0;
 }
 
 
 SealHandleScope::~SealHandleScope() {
   i::HandleScopeData* current = isolate_->handle_scope_data();
+  DCHECK_EQ(0, current->level);
+  current->level = prev_level_;
   DCHECK_EQ(current->next, current->limit);
   current->limit = prev_limit_;
-  DCHECK_EQ(current->level, current->sealed_level);
-  current->sealed_level = prev_sealed_level_;
 }
 
 
 void Context::Enter() {
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   i::Isolate* isolate = env->GetIsolate();
   ENTER_V8(isolate);
   i::HandleScopeImplementer* impl = isolate->handle_scope_implementer();
   impl->EnterContext(env);
   impl->SaveContext(isolate->context());
@@ skipping 7695 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8