[turbofan] Optimize division/modulus by constant.

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 16 matching lines @@
   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));
   }
+  Node* Word32And(Node* lhs, uint32_t rhs);
+  Node* Word32Sar(Node* lhs, uint32_t rhs);
+  Node* Word32Shr(Node* lhs, uint32_t rhs);
+  Node* Int32Add(Node* lhs, Node* rhs);
+  Node* Int32Sub(Node* lhs, Node* rhs);
+  Node* Int32Mul(Node* lhs, Node* rhs);
+
+  Node* TruncatingDiv(Node* dividend, int32_t divisor);
 
   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));
   }
   Reduction ReplaceInt64(int64_t value) {
     return Replace(Int64Constant(value));
   }
 
+  Reduction ReduceInt32Div(Node* node);
   Reduction ReduceInt32Mod(Node* node);
   Reduction ReduceProjection(size_t index, Node* node);
 
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
   CommonOperatorBuilder* common() const;
   MachineOperatorBuilder* machine() const;
 
   JSGraph* jsgraph_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_REDUCER_H_