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nir/remove_unused_variables: account for tex access via sampler_index

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

Some fixed function shaders contain samplers that are only accessed via the sampler_index from the start. Since these are actually used they should also not be removed variables list.

v2: don't track sampler use for non-uniforms (Jesse Natalie) v2: don't check used samplers twice

Signed-off-by: Gert Wollny gert.wollny@collabora.com

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