Connor Abbott
4daa3917a3
discard is supposed to be a terminator, killing the thread, so that it's possible to exit main solely by a discard e.g. inside of an infinite loop. However, it currently isn't treated as a terminator in NIR due to workarounds turning it into demote (d3d-style kill) and even if that were fixed, we probably wouldn't want to treat discard_if as a jump since otherwise the scheduler wouldn't be able to schedule things around it. So, add this workaround which inserts jump instructions as necessary to guarantee that the program always terminates. This fixes a hang in dEQP-VK.graphicsfuzz.while-inside-switch, which conditionally does a discard inside an infinite loop. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4658>
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