[turbofan] Initial import of SimplifiedOperatorReducer.

test/compiler-unittests/machine-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/base/bits.h"
 #include "src/compiler/machine-operator-reducer.h"
 #include "test/compiler-unittests/graph-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class MachineOperatorReducerTest : public GraphTest {
  public:
   explicit MachineOperatorReducerTest(int num_parameters = 2)
       : GraphTest(num_parameters), machine_(zone()) {}
   virtual ~MachineOperatorReducerTest() {}
 
  protected:
-  Node* Parameter(int32_t index) {
-    return graph()->NewNode(common()->Parameter(index), graph()->start());
-  }
-  Node* Int32Constant(int32_t value) {
-    return graph()->NewNode(common()->Int32Constant(value));
-  }
-
   Reduction Reduce(Node* node) {
     MachineOperatorReducer reducer(graph());
     return reducer.Reduce(node);
   }
 
   MachineOperatorBuilder* machine() { return &machine_; }
 
  private:
   MachineOperatorBuilder machine_;
 };
@@ skipping 84 matching lines @@
       EXPECT_TRUE(reduction.Changed());
       EXPECT_THAT(reduction.replacement(),
                   IsInt32Constant(base::bits::RotateRight32(x, y)));
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8