Removal of V2 code

[Daniel Berlin]

> BTW, shouldn't c++filt now default to the V3 mangling style too?
No. It shoudl dfault to auto, which is what it does now.
It should, however, detect V3 mangling style automatically, using the _Z
prefix.
It's a 10 minute job if someone wants to do it.

> 
> Franz.
>