[PATCH] Remove more stray returns and gcc_unreachable ()s

[Martin Sebor]

On 11/29/21 6:09 AM, Richard Biener via Gcc-patches wrote:
> This removes more cases that appear when bootstrap with
> -Wunreachable-code-return progresses.
> 
...
> diff --git a/gcc/sel-sched-ir.h b/gcc/sel-sched-ir.h
> index 8ee0529d5a8..18e03c4cb96 100644
> --- a/gcc/sel-sched-ir.h
> +++ b/gcc/sel-sched-ir.h
> @@ -1493,8 +1493,6 @@ bb_next_bb (basic_block bb)
>       default:
>         return bb->next_bb;
>       }
> -
> -  gcc_unreachable ();
>   }

Just skiming the changes out of curiosity, this one makes me
wonder if the warning shouldn't be taught to avoid triggering
on calls to __builtin_unreachable().  They can help make code
more readable (e.g., after a case and switch statement that
handles all values).

Martin