Move atomic ops and related files to base library

src/base/atomicops_internals_arm64_gcc.h

Index: src/base/atomicops_internals_arm64_gcc.h
diff --git a/src/atomicops_internals_arm64_gcc.h b/src/base/atomicops_internals_arm64_gcc.h
similarity index 97%
rename from src/atomicops_internals_arm64_gcc.h
rename to src/base/atomicops_internals_arm64_gcc.h
index 36e30a90c1e724314609bed75e92fd82939f6e48..b01783e6a7e275cfe09e53576cfecea892ab41ff 100644
--- a/src/atomicops_internals_arm64_gcc.h
+++ b/src/base/atomicops_internals_arm64_gcc.h
@@ -4,11 +4,11 @@
 
 // This file is an internal atomic implementation, use atomicops.h instead.
 
-#ifndef V8_ATOMICOPS_INTERNALS_ARM_GCC_H_
-#define V8_ATOMICOPS_INTERNALS_ARM_GCC_H_
+#ifndef V8_BASE_ATOMICOPS_INTERNALS_ARM_GCC_H_
+#define V8_BASE_ATOMICOPS_INTERNALS_ARM_GCC_H_
 
 namespace v8 {
-namespace internal {
+namespace base {
 
 inline void MemoryBarrier() {
   __asm__ __volatile__ ("dmb ish" ::: "memory");  // NOLINT
@@ -311,6 +311,6 @@ inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
   return *ptr;
 }
 
-} }  // namespace v8::internal
+} }  // namespace v8::base
 
-#endif  // V8_ATOMICOPS_INTERNALS_ARM_GCC_H_
+#endif  // V8_BASE_ATOMICOPS_INTERNALS_ARM_GCC_H_