###@###.### 2002-04-26

The JPDA backend currenty uses temporary BREAKPOINT events to cause
BREAKPOINT and SINGLE_STEP events at the same location to be in the
same event set. In HotSpot, setting and clearing a BREAKPOINT is
done via a VM operation which is done during a safepoint. This isn't
a problem with just a few threads, but doesn't scale well when you
have a lot of threads.

This logic was originally added with the following bug fix:

4195505 4/3 JVMDI: Breakpoints not reported when stepping

This change should be done with the HotSpot work being done via:

4478469 4/2 single stepping with lots of Java threads is very slow