With the SR_lock removal, the only lock that is taken with safepoint checking but sometimes with Mutex::_no_safepoint_check is the Heap_lock. That lock acquisition is during thread exit, and there's already code that doesn't do safepoint checking for that condition:

  bool is_active_Java_thread = self->is_active_Java_thread();
...
    if (is_active_Java_thread) {
      assert(rank() > Mutex::special, "Potential deadlock with special or lesser rank mutex");
      { ThreadBlockInVM tbivmdc(self->as_Java_thread(), &in_flight_mutex);
        in_flight_mutex = this; // save for ~ThreadBlockInVM
        _lock.lock();
      }

So there's no need for safepoint_check_sometimes anymore.