Function __TBB_machine_lockbyte

benchmarks/tbb/tbb_misc.cpp:278–282

   to serious performance regression with ICC. So keep it out-of-line.
 */
extern "C" intptr_t __TBB_machine_lockbyte( volatile unsigned char& flag ) {
    tbb::internal::atomic_backoff backoff;
    while( !__TBB_TryLockByte(flag) ) backoff.pause();
    return 0;
}
#endif