Use phase-local zone in the graph builder.

src/compiler/control-builders.h

 // Copyright 2013 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_CONTROL_BUILDERS_H_
 #define V8_COMPILER_CONTROL_BUILDERS_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/graph-builder.h"
@@ skipping 14 matching lines @@
   virtual ~ControlBuilder() {}
 
   // Interface for break and continue.
   virtual void Break() { UNREACHABLE(); }
   virtual void Continue() { UNREACHABLE(); }
 
  protected:
   typedef StructuredGraphBuilder Builder;
   typedef StructuredGraphBuilder::Environment Environment;
 
-  Zone* zone() const { return builder_->zone(); }
+  Zone* zone() const { return builder_->local_zone(); }
   Environment* environment() { return builder_->environment(); }
   void set_environment(Environment* env) { builder_->set_environment(env); }
 
   Builder* builder_;
 };
 
 
 // Tracks control flow for a conditional statement.
 class IfBuilder : public ControlBuilder {
  public:
@@ skipping 89 matching lines @@
   virtual void Break();
 
  private:
   Environment* break_environment_;  // Environment after the block exits.
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_CONTROL_BUILDERS_H_