StoreGate: Remove redundant lock.
We don't actually need a lock in SGImplSvc::proxy(const void* const) --- the lock in the T2pmap is sufficient. We were seeing contention here, so try removing it.
We don't actually need a lock in SGImplSvc::proxy(const void* const) --- the lock in the T2pmap is sufficient. We were seeing contention here, so try removing it.