Use ZoneVector instead of ZoneList 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 92 matching lines @@
   void EndLabel();
   void DefaultAt(int index);
   void BeginCase(int index);
   void EndCase();
   void EndSwitch();
 
   // Primitive support for break.
   virtual void Break();
 
   // The number of cases within a switch is statically known.
-  int case_count() const { return body_environments_.capacity(); }
+  size_t case_count() const { return body_environments_.size(); }
 
  private:
   Environment* body_environment_;   // Environment after last case body.
   Environment* label_environment_;  // Environment for next label condition.
   Environment* break_environment_;  // Environment after the switch exits.
-  ZoneList<Environment*> body_environments_;
+  ZoneVector<Environment*> body_environments_;
 };
 
 
 // Tracks control flow for a block statement.
 class BlockBuilder : public ControlBuilder {
  public:
   explicit BlockBuilder(StructuredGraphBuilder* builder)
       : ControlBuilder(builder), break_environment_(NULL) {}
 
   // Primitive control commands.
   void BeginBlock();
   void EndBlock();
 
   // Primitive support for break.
   virtual void Break();
 
  private:
   Environment* break_environment_;  // Environment after the block exits.
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_CONTROL_BUILDERS_H_