Use ZoneVector instead of ZoneList in the graph builder.

src/compiler/control-builders.cc

 // 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.
 
 #include "control-builders.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 60 matching lines @@
   control_if.Else();
   Break();
   control_if.End();
 }
 
 
 void SwitchBuilder::BeginSwitch() {
   body_environment_ = environment()->CopyAsUnreachable();
   label_environment_ = environment()->CopyAsUnreachable();
   break_environment_ = environment()->CopyAsUnreachable();
-  body_environments_.AddBlock(NULL, case_count(), zone());
 }
 
 
 void SwitchBuilder::BeginLabel(int index, Node* condition) {
   builder_->NewBranch(condition);
   label_environment_ = environment()->CopyForConditional();
   builder_->NewIfTrue();
   body_environments_[index] = environment();
 }
 
@@ skipping 43 matching lines @@
 }
 
 
 void BlockBuilder::EndBlock() {
   break_environment_->Merge(environment());
   set_environment(break_environment_);
 }
 }
 }
 }  // namespace v8::internal::compiler