Introduced Atomic8 and added no-barrier Atomic8 accessors.

src/atomicops_internals_arm_gcc.h

 // Copyright 2010 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 293 matching lines @@
   Atomic32 value = *ptr;
   MemoryBarrier();
   return value;
 }
 
 inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
   MemoryBarrier();
   return *ptr;
 }
 
+// Byte accessors.
+
+inline void NoBarrier_Store(volatile Atomic8* ptr, Atomic8 value) {
+  *ptr = value;
+}
+
+inline Atomic8 NoBarrier_Load(volatile const Atomic8* ptr) { return *ptr; }
+
 } }  // namespace v8::internal
 
 #endif  // V8_ATOMICOPS_INTERNALS_ARM_GCC_H_