GSoC: cp demangle non recursive

[Krishna Narayanan via Gcc]

Hello,
I have a doubt regarding the recursion part in demangle.c, what should
be the expected report when the recursion limit has been
reached,Secondly the verbose which has to be printed for the C
linkage, what should be the info that has to be displayed.
I have started working on the introduction of stacks in the file but
there is implicit recursion which hinders a lot,Hopefully I should
come up with something comprehensive subsequently.
Thanks,
Krishna Narayanan.