RFA: add support for GNU V3 C++ ABI

[Stan Shebs]

Daniel Berlin wrote:
> [...]
> And if someone from HP doesn't get back to me in about 1 week, tops, i'm
> just going to say "screw it", and if the baseclass_offset stuff breaks
> the HP aCC stuff, then when someone knowledgable enough to fix it
> comes along, they'll fix it.
> 
> This is actually what is holding me up.  I'm trying hard to do the
> right thing here, and make sure we didn't break it, but without access
> to an HP machine with HP aCC and a lot of time to reverse engineer all
> the cases, and without anyone who will answer the C++ ABI related
> questions, I can't maintain or support it.

You just said it all...  I suspect HP may no longer be able to track
FSF GDB, and have drifted off on their own.  There's been some turnover
too, which doesn't help.  A little fishing on hp.com turns up

http://devresource.hp.com/CXX/Forums/hpux-devtools/hpux-devtools.0105/author.html

which includes a bit of recent HP GDB discussion, and it has some
HP employee names that might be worth pinging directly.

Stan