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ir3: call opt_deref in optimization loop to remove unnecessary tex casts

Danylo Piliaiev requested to merge Danil/mesa:fix/ir3/opt-out-image-cast-chains into main

Otherwise we may be left with such casts:

 vec1 32 ssa_72 = deref_var &shadow_map (uniform sampler2D)
 vec1 32 ssa_73 = deref_cast (texture2D *)ssa_72 (uniform texture2D)
 vec1 32 ssa_74 = deref_cast (sampler *)ssa_72 (uniform sampler)
 vec1 32 ssa_76 = (float32)tex ssa_73 (texture_deref), ssa_74 (sampler_deref), ssa_75 (coord), ssa_64 (comparator)

And crash in ycbcr lowering since we aren't able to follow deref chain.

Fixes crash in GFXBench Aztec Ruins Vulkan tests. See issue: #5945 (closed)

Cc: mesa-stable

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