[Bug ipa/85617] Wunused-but-set-variable does not analyze variables passed to functions

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85617

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
E.g. cp_fold/c_fully_fold, gimplification, match.pd folding during
gimplification etc. can optimize away many uses.
I see no point in keeping open enhancement requests that are impossible to
implement.