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

[luoxhu at cn dot ibm.com]

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

--- Comment #10 from Xiong Hu XS Luo <luoxhu at cn dot ibm.com> ---
(In reply to Feng Xue from comment #9)
> Ok. For any followups on this, I'll create new tracker.

Seems "--param ipa-cp-eval-threshold=0  --param large-unit-insns=20000
-fno-inline" are required to do the recursive clone for digits_2?