Add a mode to completely deserialize scope chains

src/compiler-dispatcher/compiler-dispatcher-job.cc

 // Copyright 2016 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/compiler-dispatcher/compiler-dispatcher-job.h"
 
 #include "src/assert-scope.h"
 #include "src/global-handles.h"
 #include "src/isolate.h"
 #include "src/objects-inl.h"
@@ skipping 51 matching lines @@
     source_ = Handle<String>::cast(isolate_->global_handles()->Create(*source));
     character_stream_.reset(new GenericStringUtf16CharacterStream(
         source_, shared->start_position(), shared->end_position()));
   }
   parse_info_.reset(new ParseInfo(zone_.get()));
   parse_info_->set_isolate(isolate_);
   parse_info_->set_character_stream(character_stream_.get());
   parse_info_->set_hash_seed(isolate_->heap()->HashSeed());
   parse_info_->set_unicode_cache(unicode_cache_.get());
   parser_.reset(new Parser(parse_info_.get()));
+  Scope* script_scope = parser_->NewScriptScope();
+  parse_info_->set_script_scope(script_scope);
+  script_scope = Scope::DeserializeScopeChain(
+      isolate_, zone_.get(), function_->context(), script_scope,
+      parse_info_->ast_value_factory(),
+      Scope::DeserializationMode::kDeserializeOffHeap);
+  parser_->set_original_scope(script_scope);
   status_ = CompileJobStatus::kReadyToParse;
 }
 
 void CompilerDispatcherJob::Parse() {
   DCHECK(can_parse_on_background_thread_ ||
          ThreadId::Current().Equals(isolate_->thread_id()));
   DCHECK(status() == CompileJobStatus::kReadyToParse);
 
   DisallowHeapAllocation no_allocation;
   DisallowHandleAllocation no_handles;
@@ skipping 84 matching lines @@
 
   parse_info_->set_character_stream(nullptr);
   parse_info_->set_unicode_cache(nullptr);
   parser_.reset();
   unicode_cache_.reset();
   character_stream_.reset();
 }
 
 }  // namespace internal
 }  // namespace v8