third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/src/google/protobuf/stubs/atomicops_internals_x86_msvc.h

 // Protocol Buffers - Google's data interchange format
 // Copyright 2012 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // 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.
@@ skipping 64 matching lines @@
 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
   return *ptr;
 }
 
 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
   Atomic32 value = *ptr;
   return value;
 }
 
 inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
-  MemoryBarrier();
+  MemoryBarrierInternal();
   return *ptr;
 }
 
 #if defined(_WIN64)
 
 // 64-bit low-level operations on 64-bit platform.
 
 inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
                                           Atomic64 increment) {
   return Barrier_AtomicIncrement(ptr, increment);
@@ skipping 22 matching lines @@
 inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
   return *ptr;
 }
 
 inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
   Atomic64 value = *ptr;
   return value;
 }
 
 inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
-  MemoryBarrier();
+  MemoryBarrierInternal();
   return *ptr;
 }
 
 inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
                                        Atomic64 old_value,
                                        Atomic64 new_value) {
   return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
 }
 
 inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
                                        Atomic64 old_value,
                                        Atomic64 new_value) {
   return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
 }
 
 #endif  // defined(_WIN64)
 
 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google
 
 #endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_X86_MSVC_H_