Comment 3 for bug 2059856

Ok, so while gdb's symbol reader is still really wrong here --
this physname stuff is pretty broken -- the root cause of this
particular bug is also that libiberty does not auto-demangle
D symbols.

You can see this on the command line:

prentzel. c++filt _D1t1iCQf2uv
_D1t1iCQf2uv
prentzel. c++filt -s dlang _D1t1iCQf2uv
t.i

To my eye this seems to be an oversight in cplus-dem.c,
where the D code follows some earlier code; but perhaps
the author didn't realize that the reason the Ada
code does not check AUTO_DEMANGLING is that the
Ada encoding isn't unambiguous in the way the D encoding is.