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gallium: Fix u_stream_outputs_for_vertices with QUADS

Alyssa Rosenzweig requested to merge alyssa/mesa:gallium/xfb into main

Per the spec. This helper is only used in nv50 and panfrost, the latter is known to have a completely broken transform feedback implementation and I'd be unsurprised if the same is true for nv50. So unsurprising that compatibility profile interaction was missed.

This is part of the Piglit ext_transform_feedback-tessellation quads puzzle.

Cc @karolherbst @imirkin for nv50 impact, I have no way to test that hardware.

Edited by Alyssa Rosenzweig

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