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Auto merge of #156218 - cjgillot:dest-prop-range, r=Amanieu
DestinationPropagation: compute liveness as ranges instead of traveling bitsets The current implementation of `save_as_liveness` is very slow, and consists in inserting a traveling bitset in an interval set. As the `MaybeLiveLocals` has a gen-kill property, we can leverage it to make it faster. "Gen" is creating a new interval. "Kill" is ending this interval, ripe to save in the interval set.
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