Working toward supermdir split, consolidated more logic into lfsr_rbyd_inthresh
This is tricky because of the number of corner-cases that can occur: 1. Our supermdir fits as is => compact normally. 2. Our supermdir does not fit, but it does if we separate the superattrs from file attrs => uninline, but don't split. 3. Our supermdir does not fit, and does not fit after separating the superattrs => uninline and split.
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