Watching expressions that don't involve memory (e.g., watch $regfoo)

[Joel Brobecker]

> Anyone else things this is useful?  Here's a 5 minute hack at it.
> +* Watchpoints on expressions not involving memory
> +
> +  GDB now supports watching expressions that don't involve memory.
> +  This allows, for example, watching for register changes.
> +  E.g. "watch $pc" will do the right thing.

I think that this might be very useful, indeed. For instance, if
a variable is stored in a register instead of memory.

-- 
Joel