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nir: do not try to merge xfb-outputs

Erik Faye-Lund requested to merge kusma/mesa:nir-dont_merge_xfb into master

It's tricky to merge XFB-outputs correctly, because we need there to not be any overlaps when we get to nir_gather_xfb_info_with_varyings later on. We currently trigger an assert there if we end up merging here.

So let's not even try. This is an optimization, and we can optimize this in safe cases later if needed. For now, let's play it safe.

Edited by Erik Faye-Lund

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