[turbofan] Remove locally constructed simplified builders.

src/compiler/js-builtin-reducer.cc

 // Copyright 2014 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/diamond.h"
 #include "src/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
+#include "src/compiler/simplified-operator.h"
 #include "src/objects-inl.h"
 #include "src/types.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 
 // Helper class to access JSCallFunction nodes that are potential candidates
 // for reduction when they have a BuiltinFunctionId associated with them.
@@ skipping 60 matching lines @@
     // Skip first (i.e. callee) and second (i.e. receiver) operand.
     return NodeProperties::GetValueInput(node_, index + 2);
   }
 
  private:
   Node* node_;
 };
 
 
 JSBuiltinReducer::JSBuiltinReducer(Editor* editor, JSGraph* jsgraph)
-    : AdvancedReducer(editor),
-      jsgraph_(jsgraph),
-      simplified_(jsgraph->zone()) {}
+    : AdvancedReducer(editor), jsgraph_(jsgraph) {}
 
 
 // ECMA-262, section 15.8.2.11.
 Reduction JSBuiltinReducer::ReduceMathMax(Node* node) {
   JSCallReduction r(node);
   if (r.InputsMatchZero()) {
     // Math.max() -> -Infinity
     return Replace(jsgraph()->Constant(-V8_INFINITY));
   }
   if (r.InputsMatchOne(Type::Number())) {
@@ skipping 74 matching lines @@
 
 CommonOperatorBuilder* JSBuiltinReducer::common() const {
   return jsgraph()->common();
 }
 
 
 MachineOperatorBuilder* JSBuiltinReducer::machine() const {
   return jsgraph()->machine();
 }
 
+
+SimplifiedOperatorBuilder* JSBuiltinReducer::simplified() const {
+  return jsgraph()->simplified();
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8