Refactor unit tests for the base library to use GTest.

test/cctest/test-cpu-x87.cc

-// Copyright 2013 the V8 project authors. All rights reserved.
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-
-#include "src/v8.h"
-
-#include "src/base/cpu.h"
-#include "test/cctest/cctest.h"
-
-using namespace v8::internal;
-
-
-TEST(RequiredFeaturesX64) {
-  // Test for the features required by every x86 CPU in compat/legacy mode.
-  v8::base::CPU cpu;
-  CHECK(cpu.has_sahf());
-}