8211403: Rename SafepointMechanism::poll(...)

Reviewed-by: mdoerr, dcubed, dholmes

src/hotspot/share/runtime/objectMonitor.cpp

@@ -1641,7 +1641,7 @@ int ObjectMonitor::TrySpin(Thread * Self) {
     // This is in keeping with the "no loitering in runtime" rule.
     // We periodically check to see if there's a safepoint pending.
     if ((ctr & 0xFF) == 0) {
-      if (SafepointMechanism::poll(Self)) {
+      if (SafepointMechanism::should_block(Self)) {
         goto Abort;           // abrupt spin egress
       }
       SpinPause();