[turbofan] Remove locally constructed simplified builders.

src/compiler/js-intrinsic-lowering.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-intrinsic-lowering.h"
 
 #include <stack>
 
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/operator-properties.h"
 #include "src/counters.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 JSIntrinsicLowering::JSIntrinsicLowering(Editor* editor, JSGraph* jsgraph,
                                          DeoptimizationMode mode)
-    : AdvancedReducer(editor),
-      jsgraph_(jsgraph),
-      mode_(mode),
-      simplified_(jsgraph->zone()) {}
+    : AdvancedReducer(editor), jsgraph_(jsgraph), mode_(mode) {}
 
 
 Reduction JSIntrinsicLowering::Reduce(Node* node) {
   if (node->opcode() != IrOpcode::kJSCallRuntime) return NoChange();
   const Runtime::Function* const f =
       Runtime::FunctionForId(CallRuntimeParametersOf(node->op()).id());
   if (f->intrinsic_type != Runtime::IntrinsicType::INLINE) return NoChange();
   switch (f->function_id) {
     case Runtime::kInlineConstructDouble:
       return ReduceConstructDouble(node);
@@ skipping 564 matching lines @@
 
 JSOperatorBuilder* JSIntrinsicLowering::javascript() const {
   return jsgraph_->javascript();
 }
 
 
 MachineOperatorBuilder* JSIntrinsicLowering::machine() const {
   return jsgraph()->machine();
 }
 
+
+SimplifiedOperatorBuilder* JSIntrinsicLowering::simplified() const {
+  return jsgraph()->simplified();
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8