[Bug tree-optimization/79547] duplicate strlen calls with same argument not folded

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79547

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Actually the last 4 not, they return addresses into it.
But also strspn and strcspn?