Add link{L,R} for Set and Map #1141
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linkL checks whether the left tree is heavier than the right tree, but unlike link it skips checking the other way around. linkR checks the opposite. These are used where we know for certain that we only need to rebalance in one direction. link also delegates to these since the direction never changes during linking. L and R versions for merge/link2 are added for the same reason.
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linkL checks whether the left tree is heavier than the right tree, but unlike link it skips checking the other way around. linkR checks the opposite.
These are used where we know for certain that we only need to rebalance in one direction. link also delegates to these since the direction never changes during linking. L and R versions for merge/link2 are added for the same reason.
Closes #307.