Reuse AstValueFactory when optimizing.

src/compiler.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_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/zone.h"
@@ skipping 305 matching lines @@
     return abort_due_to_dependency_;
   }
 
   bool HasSameOsrEntry(Handle<JSFunction> function, BailoutId osr_ast_id) {
     return osr_ast_id_ == osr_ast_id && function.is_identical_to(closure_);
   }
 
   int optimization_id() const { return optimization_id_; }
 
   AstValueFactory* ast_value_factory() const { return ast_value_factory_; }
-  void SetAstValueFactory(AstValueFactory* ast_value_factory) {
+  void SetAstValueFactory(AstValueFactory* ast_value_factory,
+                          bool owned = true) {
     ast_value_factory_ = ast_value_factory;
+    ast_value_factory_owned_ = owned;
   }
 
  protected:
   CompilationInfo(Handle<Script> script,
                   Zone* zone);
   CompilationInfo(Handle<SharedFunctionInfo> shared_info,
                   Zone* zone);
   CompilationInfo(HydrogenCodeStub* stub,
                   Isolate* isolate,
                   Zone* zone);
@@ skipping 126 matching lines @@
   // Number of parameters used for compilation of stubs that require arguments.
   int parameter_count_;
 
   bool this_has_uses_;
 
   Handle<Foreign> object_wrapper_;
 
   int optimization_id_;
 
   AstValueFactory* ast_value_factory_;
+  bool ast_value_factory_owned_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
 };
 
 
 // Exactly like a CompilationInfo, except also creates and enters a
 // Zone on construction and deallocates it on exit.
 class CompilationInfoWithZone: public CompilationInfo {
  public:
   explicit CompilationInfoWithZone(Handle<Script> script)
@@ skipping 217 matching lines @@
   unsigned info_zone_start_allocation_size_;
   ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_