[Bug tree-optimization/67797] builtin functions should be able to know when their first argument is returned for tail calls

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67797

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note I noticed this while looking into the tail call failures of 119376 but it
was for a tail call to mempcpy like thing which is a different issue all
together and that might be filed seperately already too.