Move platform abstraction to base library

test/cctest/test-cpu-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
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 #include "src/v8.h"
 
-#include "src/cpu.h"
+#include "src/base/cpu.h"
 #include "test/cctest/cctest.h"
 
 using namespace v8::internal;
 
 
 TEST(RequiredFeaturesX64) {
   // Test for the features required by every x64 CPU.
-  CPU cpu;
+  v8::base::CPU cpu;
   CHECK(cpu.has_fpu());
   CHECK(cpu.has_cmov());
   CHECK(cpu.has_mmx());
   CHECK(cpu.has_sse());
   CHECK(cpu.has_sse2());
 }