nir/opt_move_discards_to_top: don't schedule discard/demote across subgroup operations
I'm not entirely sure if this just undefined behavior or if we need to take care.
Fixes: b447f504 ('nir: Add a discard optimization pass')
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I'm not entirely sure if this just undefined behavior or if we need to take care.
Fixes: b447f504 ('nir: Add a discard optimization pass')