PATCH: per-inferior register cache for gdbserver

[Andrew Cagney]

> Um, would there be more benefit in getting this sort of thing 
>> implemented in the core of GDB?  I just don't see a per-lwp cache in the 
>> remote target making much difference to GDB's thread debugging performance.


> I can get numbers later on how many register fetches it
> actually saves; I suspect it's fairly small.

Can you please add a comment to the code explaining this - it more of a 
design benefit than a performance benefit (the performance gains are 
unknown).

You'll notice that I'm sitting on the frame cache patch because I'm 
still analyzing its effect.  GDB already contains too much code that 
``claims to improve performance''.

enjoy,
Andrew