[Bug c/92086] Provide way to avoid saving callee-saved registers in functions without callers

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92086

--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This is related to the compiler saving the return address for noreturn
sibcalls, like in

  void g(void) __attribute__((noreturn));
  void f(void) { g(); }

Maybe we should have an option like "-fimprove-debugging-experience" that
defaults to true only for -O0 and -Og (and maybe -O1)?