[turbofan] Move SimplifiedOperatorBuilder into JSGraph.

src/compiler/js-global-specialization.cc

 // Copyright 2015 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 "src/compiler/js-global-specialization.h"
 
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
@@ skipping 12 matching lines @@
 };
 
 
 JSGlobalSpecialization::JSGlobalSpecialization(
     Editor* editor, JSGraph* jsgraph, Flags flags,
     Handle<GlobalObject> global_object, CompilationDependencies* dependencies)
     : AdvancedReducer(editor),
       jsgraph_(jsgraph),
       flags_(flags),
       global_object_(global_object),
-      dependencies_(dependencies),
-      simplified_(graph()->zone()) {}
+      dependencies_(dependencies) {}
 
 
 Reduction JSGlobalSpecialization::Reduce(Node* node) {
   switch (node->opcode()) {
     case IrOpcode::kJSLoadGlobal:
       return ReduceJSLoadGlobal(node);
     case IrOpcode::kJSStoreGlobal:
       return ReduceJSStoreGlobal(node);
     default:
       break;
@@ skipping 225 matching lines @@
 
 CommonOperatorBuilder* JSGlobalSpecialization::common() const {
   return jsgraph()->common();
 }
 
 
 JSOperatorBuilder* JSGlobalSpecialization::javascript() const {
   return jsgraph()->javascript();
 }
 
+
+SimplifiedOperatorBuilder* JSGlobalSpecialization::simplified() const {
+  return jsgraph()->simplified();
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8