Implement byte swapping instructions on MIPS32 and MIPS64.

test/cctest/test-assembler-mips.cc

 // Copyright 2012 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 3388 matching lines @@
     t.r1 = 0x781A15C3;
     t.r2 = 0x8B71FCDE;
     Object* dummy = CALL_GENERATED_CODE(isolate, f, &t, 0, 0, 0, 0);
     USE(dummy);
 
     CHECK_EQ(static_cast<int32_t>(0x1E58A8C3), t.r1);
     CHECK_EQ(static_cast<int32_t>(0xD18E3F7B), t.r2);
   }
 }
 
-
 TEST(class_fmt) {
   if (IsMipsArchVariant(kMips32r6)) {
     // Test CLASS.fmt instruction.
     CcTest::InitializeVM();
     Isolate* isolate = CcTest::i_isolate();
     HandleScope scope(isolate);
 
     typedef struct {
       double dSignalingNan;
       double dQuietNan;
@@ skipping 1960 matching lines @@
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
   F2 f = FUNCTION_CAST<F2>(code->entry());
 
   int32_t res = reinterpret_cast<int32_t>(
       CALL_GENERATED_CODE(isolate, f, 42, 42, 0, 0, 0));
   CHECK_EQ(res, 0);
 }
 
 #undef __