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This can come up if, for instance, the shader does a derivative of a uniform or flat input. Ideally, NIR would use divergence analysis to get rid of the derivative in this case but it doesn't right now. This fixes a crash in F1 2017. Cc: mesa-stable@lists.freedesktop.org Reported-by: Marcin Ślusarz <marcin.slusarz@intel.com> Tested-by: Marcin Ślusarz <marcin.slusarz@intel.com> Reviewed-by: Matt Turner <mattst88@gmail.com> Part-of: <!6564> (cherry picked from commit 8e8701b4)
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