AMDGPU: Fix treating divergent loads as uniform (#168785) Avoids regression which caused the revert 6d5f87fc42. This is a hack on a hack. We currently have isUniformMMO, which improperly treats unknown source value as known uniform. This is hack from before we had divergence information in the DAG, and should be removed. This is the minimum change to avoid the regression; removing the aggressive handling of the unknown case (or dropping isUniformMMO entirely) are more involved fixes.
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