nir/lower_clip: Fix incorrect driver loc for clipdist outputs
Somehow adjusting maxloc based on existing outputs got lost, resulting
in the clipdist varying clobbering the position varying. Causing a
shader that had no position output in freedreno/ir3, which triggers GPU
hangs in neverball.
Fixes:
d0f746b6458 ("nir: Save nir_variable pointers in nir_lower_clip_vs rather than locs.")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
(cherry picked from commit
372ed42d222a274abe712b62f4b037cbeb6fddb5)
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