bug#58509: 29.0.50; Synchronous nativecomp

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: akrl@sdf.org,  58509@debbugs.gnu.org
> Date: Mon, 17 Oct 2022 21:30:24 +0200
> 
> Sure, we can do it via a command-line argument instead.  Perhaps this
> fits well with the proposed --native-compile-sync switch, even.
> 
> That is, instead of that, we could have a --native-compile-mode command
> line switch with the values --native-compile-mode=none,
> --native-compile-mode=sync and --native-compile-mode=normal?

I doubt we really need to have an option with 3 values.  The default
already does TRT in almost all cases, so all we need is to suppress
async compilation of trampolines, because that could cause trouble.