Intercept panic calls and replace them with aborts. #305
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Where "abort" currently is equivalent to
loop {}, but we could try to do something better in the future.(Ideally we'd use a future variant of
OpKillthat works in all shaders, and ideally has the right semantics of leaving some kind of indication that there was an error in some shader invocation, but that might be asking for too much)The reason this is "WIP", even if it does work (see the test changes), is because, in order to defer errors from creating unsupported constants (mostly&panic::Location) passed to panic entry-points, I had to turn them into zombies.So the tests only work because the panic calls are replaced with "abort"s, and the zombie constants never used.
From my discussion with @khyperia, we should be able to use zombies here (and in other places), if we can properly trackSpans for them, and I believe that's doable, but haven't gotten around to it.EDIT: that's all done, thanks to #311!