[Bug c/19315] document undocumented extension that allows code where variable is not emitted in the asm

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19315

--- Comment #8 from rguenther at suse dot de <rguenther at suse dot de> ---
On July 25, 2018 5:50:40 PM GMT+02:00, "egallager at gcc dot gnu.org"
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19315
>
>Eric Gallager <egallager at gcc dot gnu.org> changed:
>
>           What    |Removed                     |Added
>----------------------------------------------------------------------------
>            CC|                            |rguenth at gcc dot gnu.org,
>                |                            |schwab at gcc dot gnu.org

Just remove the extension and see where in the testsuite it fails. If it
doesn't, simply remove it.