Move atomic ops and related files to base library

src/base/atomicops_internals_tsan.h

Index: src/base/atomicops_internals_tsan.h
diff --git a/src/atomicops_internals_tsan.h b/src/base/atomicops_internals_tsan.h
similarity index 98%
rename from src/atomicops_internals_tsan.h
rename to src/base/atomicops_internals_tsan.h
index e100812499c7930643b7092a395a6b87031a32e3..363668d86d3c7b65b7656472d538aaf5ee076b7f 100644
--- a/src/atomicops_internals_tsan.h
+++ b/src/base/atomicops_internals_tsan.h
@@ -6,11 +6,11 @@
 // 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
@@ -371,9 +371,9 @@ 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_