[turbofan] Machine operators are globally shared singletons.

test/cctest/compiler/test-scheduler.cc

Index: test/cctest/compiler/test-scheduler.cc
diff --git a/test/cctest/compiler/test-scheduler.cc b/test/cctest/compiler/test-scheduler.cc
index 9c0d38f445b1f0837602f23d4bdd421e28e194a6..cf3312351d2e3dec04cb07660c50de96e8bd7aa8 100644
--- a/test/cctest/compiler/test-scheduler.cc
+++ b/test/cctest/compiler/test-scheduler.cc
@@ -1509,7 +1509,7 @@ TEST(BuildScheduleSimpleLoopWithCodeMotion) {
   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 =
@@ -1668,7 +1668,7 @@ 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);
@@ -1691,7 +1691,7 @@ 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);