Implement flooring division by a constant via truncating division by a constant.

src/a64/lithium-a64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1938 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(FlooringDivByPowerOf2I,
                                "flooring-div-by-power-of-2-i")
   DECLARE_HYDROGEN_ACCESSOR(MathFloorOfDiv)
 
  private:
   int32_t divisor_;
 };
 
 
-class LFlooringDivByConstI V8_FINAL : public LTemplateInstruction<1, 1, 0> {
+class LFlooringDivByConstI V8_FINAL : public LTemplateInstruction<1, 1, 2> {
  public:
-  LFlooringDivByConstI(LOperand* dividend, int32_t divisor) {
+  LFlooringDivByConstI(LOperand* dividend, int32_t divisor, LOperand* temp) {
     inputs_[0] = dividend;
     divisor_ = divisor;
+    temps_[0] = temp;
   }
 
   LOperand* dividend() { return inputs_[0]; }
   int32_t divisor() const { return divisor_; }
-  LOperand* temp1() { return temps_[0]; }
+  LOperand* temp() { return temps_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(FlooringDivByConstI, "flooring-div-by-const-i")
   DECLARE_HYDROGEN_ACCESSOR(MathFloorOfDiv)
 
  private:
   int32_t divisor_;
 };
 
 
 class LFlooringDivI V8_FINAL : public LTemplateInstruction<1, 2, 1> {
@@ skipping 1111 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_LITHIUM_A64_H_