[patch] More DWARF-4 support

[Tom Tromey]

>>>>> "Cary" == Cary Coutant <ccoutant@google.com> writes:

>> I think dwarf2.h should refer to the documentation for all extensions.
>> Undocumented extensions have already caused problems for people writing
>> new readers.

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.

Tom