Add a mode to completely deserialize scope chains

src/ast/scopes.h

 // 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.
 
 #ifndef V8_AST_SCOPES_H_
 #define V8_AST_SCOPES_H_
 
 #include "src/ast/ast.h"
 #include "src/base/hashmap.h"
 #include "src/globals.h"
@@ skipping 96 matching lines @@
     Scope* top_inner_scope_;
     VariableProxy* top_unresolved_;
     int top_temp_;
   };
 
   // Compute top scope and allocate variables. For lazy compilation the top
   // scope only contains the single lazily compiled function, so this
   // doesn't re-allocate variables repeatedly.
   static bool Analyze(ParseInfo* info);
 
+  enum class DeserializationMode { kDeserializeOffHeap, kKeepScopeInfo };
+
   static Scope* DeserializeScopeChain(Isolate* isolate, Zone* zone,
                                       Context* context, Scope* script_scope,
-                                      AstValueFactory* ast_value_factory);
+                                      AstValueFactory* ast_value_factory,
+                                      DeserializationMode deserialization_mode);
 
   // The scope name is only used for printing/debugging.
   void SetScopeName(const AstRawString* scope_name) {
     scope_name_ = scope_name;
   }
 
   void DeclareThis(AstValueFactory* ast_value_factory);
   void DeclareDefaultFunctionVariables(AstValueFactory* ast_value_factory);
 
   // Checks if the block scope is redundant, i.e. it does not contain any
@@ skipping 714 matching lines @@
          scope = scope->sibling_) {
       if (scope->sibling_ == inner_scope) {
         scope->sibling_ = scope->sibling_->sibling_;
         return;
       }
     }
   }
 
   void SetDefaults();
 
+  void DeserializeScopeInfo(Isolate* isolate,
+                            AstValueFactory* ast_value_factory);
+
   PendingCompilationErrorHandler pending_error_handler_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_SCOPES_H_