MIPS: Enable big endian testing.

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 2030 matching lines @@
 TEST(movz_movn) {
   if (IsMipsArchVariant(kMips32r2)) {
     const int kTableLength = 4;
     CcTest::InitializeVM();
     Isolate* isolate = CcTest::i_isolate();
     HandleScope scope(isolate);
     MacroAssembler assm(isolate, NULL, 0,
                         v8::internal::CodeObjectRequired::kYes);
 
     typedef struct test_float {
-      int64_t rt;
+      int32_t rt;
       double a;
       double b;
       double bold;
       double b1;
       double bold1;
       float c;
       float d;
       float dold;
       float d1;
       float dold1;
@@ skipping 3316 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 __