[Bug tree-optimization/81811] missing -Wreturn-local-addr returning strcpy result

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81811

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Wonder whether the memcpy case is because we fold the memcpy away as both
memcpy and strcpy are marked RET1 (returns arg1).