[Bug 110953] Adding a redundant single-iteration do-while loop causes different image to be rendered

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110953

--- Comment #6 from Ian Romanick <idr at freedesktop.org> ---
This MR should fix the bug:

https://gitlab.freedesktop.org/mesa/mesa/merge_requests/1152

And this MR has a minimal test case:

https://gitlab.freedesktop.org/mesa/piglit/merge_requests/88

I'm running both through Intel's CI on G33 hardware.  That very, very old
hardware has OpenGL ES 2.0, but it does not use the NIR loop unrolling path. 
It should hit this bug... I'll find out for sure in the morning.  I tried the
test and the fix on my local machine using softpipe.

@abel: Can you test the fix on nouveau?

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