Fixed and improved code for integral division. Fixed and extended tests.

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 1244 matching lines @@
   LDivI(LOperand* left, LOperand* right, LOperand* temp) {
     inputs_[0] = left;
     inputs_[1] = right;
     temps_[0] = temp;
   }
 
   LOperand* left() { return inputs_[0]; }
   LOperand* right() { return inputs_[1]; }
   LOperand* temp() { return temps_[0]; }
 
+  bool is_flooring() { return hydrogen_value()->IsMathFloorOfDiv(); }
+
   DECLARE_CONCRETE_INSTRUCTION(DivI, "div-i")
   DECLARE_HYDROGEN_ACCESSOR(Div)
 };
 
 
 class LDoubleToIntOrSmi V8_FINAL : public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LDoubleToIntOrSmi(LOperand* value) {
     inputs_[0] = value;
   }
@@ skipping 1681 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_LITHIUM_A64_H_