Move platform abstraction to base library

test/cctest/test-cpu-x64.cc

Index: test/cctest/test-cpu-x64.cc
diff --git a/test/cctest/test-cpu-x64.cc b/test/cctest/test-cpu-x64.cc
index 7f9fafaf4464ff5e9b770f0ed0df3f5ac270fd94..2e1dd3755b99a45a8c8b80af81143438ca07e751 100644
--- a/test/cctest/test-cpu-x64.cc
+++ b/test/cctest/test-cpu-x64.cc
@@ -27,7 +27,7 @@
 
 #include "src/v8.h"
 
-#include "src/cpu.h"
+#include "src/base/cpu.h"
 #include "test/cctest/cctest.h"
 
 using namespace v8::internal;
@@ -35,7 +35,7 @@ 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());