Move atomic ops and related files to base library

src/base/atomicops_internals_tsan.h

 // Copyright 2012 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.
 
 
 // This file is an internal atomic implementation for compiler-based
 // ThreadSanitizer. Use base/atomicops.h instead.
 
-#ifndef V8_ATOMICOPS_INTERNALS_TSAN_H_
-#define V8_ATOMICOPS_INTERNALS_TSAN_H_
+#ifndef V8_BASE_ATOMICOPS_INTERNALS_TSAN_H_
+#define V8_BASE_ATOMICOPS_INTERNALS_TSAN_H_
 
 namespace v8 {
-namespace internal {
+namespace base {
 
 #ifndef TSAN_INTERFACE_ATOMIC_H
 #define TSAN_INTERFACE_ATOMIC_H
 
 // This struct is not part of the public API of this module; clients may not
 // use it.  (However, it's exported via BASE_EXPORT because clients implicitly
 // do use it at link time by inlining these functions.)
 // Features of this x86.  Values may not be correct before main() is run,
 // but are set conservatively.
 struct AtomicOps_x86CPUFeatureStruct {
@@ skipping 340 matching lines @@
   Atomic64 cmp = old_value;
   __tsan_atomic64_compare_exchange_strong(ptr, &cmp, new_value,
       __tsan_memory_order_release, __tsan_memory_order_relaxed);
   return cmp;
 }
 
 inline void MemoryBarrier() {
   __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
 }
 
-}  // namespace internal
+}  // namespace base
 }  // namespace v8
 
 #undef ATOMICOPS_COMPILER_BARRIER
 
-#endif  // V8_ATOMICOPS_INTERNALS_TSAN_H_
+#endif  // V8_BASE_ATOMICOPS_INTERNALS_TSAN_H_