[turbofan] Machine operators are globally shared singletons.

src/compiler/simplified-operator-reducer-unittest.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/graph-unittest.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/simplified-operator-reducer.h"
 #include "src/compiler/typer.h"
 #include "src/conversions.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class SimplifiedOperatorReducerTest : public GraphTest {
  public:
   explicit SimplifiedOperatorReducerTest(int num_parameters = 1)
       : GraphTest(num_parameters), simplified_(zone()) {}
   virtual ~SimplifiedOperatorReducerTest() {}
 
  protected:
   Reduction Reduce(Node* node) {
     Typer typer(zone());
-    MachineOperatorBuilder machine(zone());
+    MachineOperatorBuilder machine;
     JSGraph jsgraph(graph(), common(), &typer);
     SimplifiedOperatorReducer reducer(&jsgraph, &machine);
     return reducer.Reduce(node);
   }
 
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
 
  private:
   SimplifiedOperatorBuilder simplified_;
 };
@@ skipping 436 matching lines @@
         Reduce(graph()->NewNode(simplified()->ChangeUint32ToTagged(),
                                 Int32Constant(bit_cast<int32_t>(n))));
     ASSERT_TRUE(reduction.Changed());
     EXPECT_THAT(reduction.replacement(), IsNumberConstant(FastUI2D(n)));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8