glsl: Ignore ir_texture in lower_const_arrays_to_uniforms.
The only part of an ir_texture which can be an array is the offsets array in textureGatherOffsets() calls. We don't want to lower those, because they're required to remain constants. Fixes textureGatherOffsets with Gallium drivers such as llvmpipe, which commit ef78df8d regressed. Cc: mesa-stable@lists.freedesktop.org Signed-off-by:Kenneth Graunke <kenneth@whitecape.org> Reviewed-by:
Ilia Mirkin <imirkin@alum.mit.edu> (cherry picked from commit a36a73a7)