[RFA]: Fix for pending breakpoints in manually loaded/unloaded shlibs

[Andrew Cagney]

>>> Date: Wed, 11 Aug 2004 16:42:24 -0400
>>> From: Andrew Cagney <cagney@gnu.org>
>>> 
>>> Um, observers were introduced for this purpose - make it possible for 
>>> anything, core or peripheral, to monitor changes in the inferior/GDB. 
> 
> 
> But we don't want to _monitor_ anything in this case.  We want to fox
> a specific, well-defined problem due to a specific course of events.

And that well defined course of events is called an shlib unload.  Lets 
abstract it as such.

Andrew