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[NFCI] Split isPotentiallyReachable into two implementations.
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Authored by nicholas on Apr 16 2019, 12:40 AM.
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Summary

The new implementations are one "fast path" implementation using the DominatorTree and not supporting ExcludedBlocks, and a "slow path" that walks BasicBlocks and supports ExcludedBlocks. Both take advantage of LoopInfo if available.

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