nvptx: Implement '_exit' instead of 'exit'

[Jeff Johnston]

LGTM

-- Jeff J.

On Thu, Dec 1, 2022 at 4:14 PM Thomas Schwinge <thomas@codesourcery.com>
wrote:

> Hi!
>
> I'm working on support for global constructors/destructors with
> GCC/nvptx, and to invoke the latter, we need 'atexit' to work -- as is
> achieved by the attached "nvptx: Implement '_exit' instead of 'exit'";
> any comments before I push that one?
>
>
> Grüße
>  Thomas
>
>
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