Move platform abstraction to base library

src/base/cpu.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "src/cpu.h"
+#include "src/base/cpu.h"
 
 #if V8_LIBC_MSVCRT
 #include <intrin.h>  // __cpuid()
 #endif
 #if V8_OS_POSIX
 #include <unistd.h>  // sysconf()
 #endif
 #if V8_OS_QNX
 #include <sys/syspage.h>  // cpuinfo
 #endif
 
 #include <ctype.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <algorithm>
 
-#include "src/checks.h"
+#include "src/base/logging.h"
 #if V8_OS_WIN
 #include "src/base/win32-headers.h"  // NOLINT
 #endif
 
 namespace v8 {
-namespace internal {
+namespace base {
 
 #if V8_HOST_ARCH_IA32 || V8_HOST_ARCH_X64
 
 // Define __cpuid() for non-MSVC libraries.
 #if !V8_LIBC_MSVCRT
 
 static V8_INLINE void __cpuid(int cpu_info[4], int info_type) {
 #if defined(__i386__) && defined(__pic__)
   // Make sure to preserve ebx, which contains the pointer
   // to the GOT in case we're generating PIC.
@@ skipping 447 matching lines @@
     part_ = strtol(part, &end, 0);
     if (end == part) {
       part_ = 0;
     }
     delete[] part;
   }
 
 #endif
 }
 
-} }  // namespace v8::internal
+} }  // namespace v8::base