Fix compilation with GCC 4.8

test/cctest/test-macro-assembler-x64.cc

 // Copyright 2009 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 2309 matching lines @@
   CodeDesc desc;
   masm->GetCode(&desc);
   // Call the function from C++.
   int result = FUNCTION_CAST<F0>(buffer)();
   CHECK_EQ(0, result);
 }
 
 
 TEST(OperandOffset) {
   i::V8::Initialize(NULL);
-  int data[256];
-  for (int i = 0; i < 256; i++) { data[i] = i * 0x01010101; }
+  uint32_t data[256];
+  for (uint32_t i = 0; i < 256; i++) { data[i] = i * 0x01010101; }
 
   // Allocate an executable page of memory.
   size_t actual_size;
   byte* buffer =
       static_cast<byte*>(OS::Allocate(Assembler::kMinimalBufferSize * 2,
                                       &actual_size,
                                       true));
   CHECK(buffer);
   Isolate* isolate = CcTest::i_isolate();
   HandleScope handles(isolate);
@@ skipping 485 matching lines @@
 
   CodeDesc desc;
   masm->GetCode(&desc);
   // Call the function from C++.
   int result = FUNCTION_CAST<F0>(buffer)();
   CHECK_EQ(0, result);
 }
 
 
 #undef __