64/32 threaded app support

[Andrew Cagney]

> I found that the following patches
> 
> http://sources.redhat.com/ml/gdb-patches/2004-03/msg00177.html
> http://sources.redhat.com/ml/gdb-patches/2004-03/msg00176.html
> 
> fixes my problems(see below), any idea why these dint make it into 6.1?

I dropped them as it was getting late in the release cycle, and there 
are too many other patches needed before 64-bit PPC really starts to 
work (sigtramp, frame rewrite).  Hopefully 6.2 will be a viable for 
64-bit PPC.

However, Kevin might be interested in a backport of these and some other 
changes.

Andrew