Introduced Atomic8 and added no-barrier Atomic8 accessors.

src/atomicops_internals_tsan.h

Index: src/atomicops_internals_tsan.h
diff --git a/src/atomicops_internals_tsan.h b/src/atomicops_internals_tsan.h
index 1819798a5d361d20a8e4df61fce6dda507da6522..ce5774efd2019ffe1cb6d3db5349a472298d3f9b 100644
--- a/src/atomicops_internals_tsan.h
+++ b/src/atomicops_internals_tsan.h
@@ -276,6 +276,10 @@ inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
   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);
 }
@@ -289,6 +293,10 @@ 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);
 }