[Bug target/82158] _Noreturn functions that do return clobber caller's registers on ARM32 (but not other arches)

[peter at cordes dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82158

--- Comment #1 from Peter Cordes <peter at cordes dot ca> ---
Related: bug 55747 describes why gcc keeps the `push {r4, lr}` in the _Noreturn
function: backtraces.