[Bug rtl-optimization/10837] noreturn attribute causes no sibling calling optimization

[lukas.graetz--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10837

--- Comment #36 from Lukas Grätz <lukas.gra...@tu-darmstadt.de> ---
I filed PR 121651 to add better diagnostics when musttail is incorrectly used
in a function signature.