[Bug c/92479] missing warnings for unreachable codes with -Wunreachable-code

[tangyixuan at mail dot dlut.edu.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92479

--- Comment #3 from tangyixuan <tangyixuan at mail dot dlut.edu.cn> ---
(In reply to Andrew Pinski from comment #1)
> The code for Wunreachable-code was removed a long time ago (around 5-10
> years ago).

Thanks for your time, Andrew.
I didn't notice that the -Wunreachable-code is ignored by GCC now. Maybe the
other flag could do this.