Introduced Atomic8 and added no-barrier Atomic8 accessors.

src/atomicops_internals_tsan.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 258 matching lines @@
 
 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
                                        Atomic32 old_value,
                                        Atomic32 new_value) {
   Atomic32 cmp = old_value;
   __tsan_atomic32_compare_exchange_strong(ptr, &cmp, new_value,
       __tsan_memory_order_release, __tsan_memory_order_relaxed);
   return cmp;
 }
 
+inline void NoBarrier_Store(volatile Atomic8* ptr, Atomic8 value) {
+  __tsan_atomic8_store(ptr, value, __tsan_memory_order_relaxed);
+}
+
 inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
   __tsan_atomic32_store(ptr, value, __tsan_memory_order_relaxed);
 }
 
 inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
   __tsan_atomic32_store(ptr, value, __tsan_memory_order_relaxed);
   __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
 }
 
 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
   __tsan_atomic32_store(ptr, value, __tsan_memory_order_release);
 }
 
+inline Atomic8 NoBarrier_Load(volatile const Atomic8* ptr) {
+  return __tsan_atomic8_load(ptr, __tsan_memory_order_relaxed);
+}
+
 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
   return __tsan_atomic32_load(ptr, __tsan_memory_order_relaxed);
 }
 
 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
   return __tsan_atomic32_load(ptr, __tsan_memory_order_acquire);
 }
 
 inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
   __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
@@ skipping 83 matching lines @@
 inline void MemoryBarrier() {
   __tsan_atomic_thread_fence(__tsan_memory_order_seq_cst);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #undef ATOMICOPS_COMPILER_BARRIER
 
 #endif  // V8_ATOMICOPS_INTERNALS_TSAN_H_