[turbofan] Reduce shl with sar/shr and same shift amount to bit-and.

src/compiler/machine-operator-reducer.h

 // 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.
 
 #ifndef V8_COMPILER_MACHINE_OPERATOR_REDUCER_H_
 #define V8_COMPILER_MACHINE_OPERATOR_REDUCER_H_
 
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/machine-operator.h"
 
@@ skipping 13 matching lines @@
   explicit MachineOperatorReducer(JSGraph* jsgraph);
   ~MachineOperatorReducer();
 
   virtual Reduction Reduce(Node* node) OVERRIDE;
 
  private:
   Node* Float32Constant(volatile float value);
   Node* Float64Constant(volatile double value);
   Node* Int32Constant(int32_t value);
   Node* Int64Constant(int64_t value);
+  Node* Uint32Constant(uint32_t value) {
+    return Int32Constant(bit_cast<uint32_t>(value));
+  }
 
   Reduction ReplaceBool(bool value) { return ReplaceInt32(value ? 1 : 0); }
   Reduction ReplaceFloat32(volatile float value) {
     return Replace(Float32Constant(value));
   }
   Reduction ReplaceFloat64(volatile double value) {
     return Replace(Float64Constant(value));
   }
   Reduction ReplaceInt32(int32_t value) {
     return Replace(Int32Constant(value));
@@ skipping 10 matching lines @@
   MachineOperatorBuilder* machine() const;
 
   JSGraph* jsgraph_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_REDUCER_H_