[Bug ipa/92133] Support multi versioning on self recursive function

[fxue at os dot amperecomputing.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92133

--- Comment #2 from Feng Xue <fxue at os dot amperecomputing.com> ---
(In reply to Martin Liška from comment #1)
> Let me take a look.

I've created a patch
(https://gcc.gnu.org/ml/gcc-patches/2019-10/msg01260.html), could you take a
time to review it?