bc1bed77a8
root of the too-short tree is black and at least one of the children of that sibling is red, either one or two rotations finish the rebalancing. In the case when both of the children are red, the current implementation uses two rotations where only one is necessary. This change removes that extra rotation, and in that case also removes a needless black-to-red-to-black recoloring. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D25335
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