[patch] More DWARF-4 support

[Cary Coutant]

> Cary> Good point. They're described in the following document:
> Cary>    http://docs.google.com/Doc?id=dchhtd34_75dz7zbjgq
> Cary> Is a pointer to that sufficient?
>
> I would prefer a GNU related site, like the GCC wiki, or even somewhere
> in the source tree.

http://gcc.gnu.org/wiki/ThreadSafetyAnnotation

How's this? It gives an overview of the whole thread-safety annotation
design, and points to the DWARF proposal in Google Docs.

-cary