Demangling of method names and addr2line/c++filt

[Ranjit Mathew]

> Surely the question is should c++filt work when passed the output of
> addr2line?

Considering that the hapless "c++filt" is supposed to work when passed
the output of *either* "nm" (raw names) or "addr2line" (stripped-of-
leading-underscore names), IMHO you must help it out a little by passing 
it a "-n" to indicate an addr2line output.

Ranjit