[turbofan] Machine operators are globally shared singletons.

test/cctest/compiler/test-scheduler.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/v8.h"
 #include "test/cctest/cctest.h"
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/generic-node-inl.h"
 #include "src/compiler/generic-node.h"
@@ skipping 1491 matching lines @@
   ComputeAndVerifySchedule(62, &graph);
 }
 
 
 TEST(BuildScheduleSimpleLoopWithCodeMotion) {
   HandleAndZoneScope scope;
   Isolate* isolate = scope.main_isolate();
   Graph graph(scope.main_zone());
   CommonOperatorBuilder common_builder(scope.main_zone());
   JSOperatorBuilder js_builder(scope.main_zone());
-  MachineOperatorBuilder machine_builder(scope.main_zone());
+  MachineOperatorBuilder machine_builder;
   const Operator* op;
 
   Handle<Object> object =
       Handle<Object>(isolate->heap()->undefined_value(), isolate);
   Unique<Object> unique_constant = Unique<Object>::CreateUninitialized(object);
 
   // Manually transcripted code for:
   // function turbo_fan_test(a, b, c) {
   //   while (a < b) {
   //     a += b + c;
@@ skipping 138 matching lines @@
   graph.SetEnd(end);
 
   ComputeAndVerifySchedule(13, &graph);
 }
 
 
 TEST(FloatingDiamond2) {
   HandleAndZoneScope scope;
   Graph graph(scope.main_zone());
   CommonOperatorBuilder common(scope.main_zone());
-  MachineOperatorBuilder machine(scope.main_zone());
+  MachineOperatorBuilder machine;
 
   Node* start = graph.NewNode(common.Start(2));
   graph.SetStart(start);
 
   Node* p0 = graph.NewNode(common.Parameter(0), start);
   Node* p1 = graph.NewNode(common.Parameter(1), start);
   Node* d1 = CreateDiamond(&graph, &common, p0);
   Node* d2 = CreateDiamond(&graph, &common, p1);
   Node* add = graph.NewNode(machine.Int32Add(), d1, d2);
   Node* ret = graph.NewNode(common.Return(), add, start, start);
   Node* end = graph.NewNode(common.End(), ret, start);
 
   graph.SetEnd(end);
 
   ComputeAndVerifySchedule(24, &graph);
 }
 
 
 TEST(FloatingDiamond3) {
   HandleAndZoneScope scope;
   Graph graph(scope.main_zone());
   CommonOperatorBuilder common(scope.main_zone());
-  MachineOperatorBuilder machine(scope.main_zone());
+  MachineOperatorBuilder machine;
 
   Node* start = graph.NewNode(common.Start(2));
   graph.SetStart(start);
 
   Node* p0 = graph.NewNode(common.Parameter(0), start);
   Node* p1 = graph.NewNode(common.Parameter(1), start);
   Node* d1 = CreateDiamond(&graph, &common, p0);
   Node* d2 = CreateDiamond(&graph, &common, p1);
   Node* add = graph.NewNode(machine.Int32Add(), d1, d2);
   Node* d3 = CreateDiamond(&graph, &common, add);
   Node* ret = graph.NewNode(common.Return(), d3, start, start);
   Node* end = graph.NewNode(common.End(), ret, start);
 
   graph.SetEnd(end);
 
   ComputeAndVerifySchedule(33, &graph);
 }
 
 #endif