[Bug c/91206] -Wformat doesn't warn for %hd with char parameter

[ndesaulniers at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91206

--- Comment #2 from Nick Desaulniers <ndesaulniers at google dot com> ---
Ah, I did file a bug for this in LLVM's issue tracker:
https://bugs.llvm.org/show_bug.cgi?id=41467