freedreno/ir3: Drop handling FRAG_RESULT_DEPTH writing to .z
Since we consume NIR, we get FRAG_RESULT_DEPTH in .x. Something must have been working out for this code to not be trying to get an undefined value, but go ahead and drop it now.
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Since we consume NIR, we get FRAG_RESULT_DEPTH in .x. Something must have been working out for this code to not be trying to get an undefined value, but go ahead and drop it now.