Patch: merge src and gcc copies of dwarf2.h

[Tom Tromey]

>>>>> "Ian" == Ian Lance Taylor <iant@google.com> writes:

>> 2009-07-01  Tom Tromey  <tromey@redhat.com>
>> * elf/dwarf2.h: Remove, renaming to...
>> * dwarf2.h: ... this.

Ian> I'm not sure I really understand what the problem is.  After all, we
Ian> already share files in the include directory between gcc and src.  But
Ian> if this seems like the right patch to make, it's OK.

I'm finally checking this in.  Sorry this has taken so long, I got
distracted.  I'll send a followup re-merge patch soon, and also the
patch to src.

Tom