Fix missed wakeup in lock free transfer cache
Fix missed wakeup in lock free transfer cache

A missing memory barrier between the store of "v_" and the load of "sleepers_"
could cause a missed futex wakeup. This would cause the waiter thread to wait
indefinitely, deadlocking a process.

PiperOrigin-RevId: 343919447
Change-Id: Ia0b5a6ebdcbc6931e94ac71a65d61e303ec96217

google/tcmalloc,google/tcmalloc,google/tcmalloc