Move atomic ops and related files to base library

src/base/atomicops_internals_x86_gcc.h

 // Copyright 2010 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, use atomicops.h instead.
 
-#ifndef V8_ATOMICOPS_INTERNALS_X86_GCC_H_
-#define V8_ATOMICOPS_INTERNALS_X86_GCC_H_
+#ifndef V8_BASE_ATOMICOPS_INTERNALS_X86_GCC_H_
+#define V8_BASE_ATOMICOPS_INTERNALS_X86_GCC_H_
 
 namespace v8 {
-namespace internal {
+namespace base {
 
 // This struct is not part of the public API of this module; clients may not
 // use it.
 // Features of this x86.  Values may not be correct before main() is run,
 // but are set conservatively.
 struct AtomicOps_x86CPUFeatureStruct {
   bool has_amd_lock_mb_bug;  // Processor has AMD memory-barrier bug; do lfence
                              // after acquire compare-and-swap.
   bool has_sse2;             // Processor has SSE2.
 };
@@ skipping 236 matching lines @@
 }
 
 inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
                                        Atomic64 old_value,
                                        Atomic64 new_value) {
   return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
 }
 
 #endif  // defined(__x86_64__)
 
-} }  // namespace v8::internal
+} }  // namespace v8::base
 
 #undef ATOMICOPS_COMPILER_BARRIER
 
-#endif  // V8_ATOMICOPS_INTERNALS_X86_GCC_H_
+#endif  // V8_BASE_ATOMICOPS_INTERNALS_X86_GCC_H_