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reachableroots: add a C implementation

This patch is part of a series of patches to speed up the computation of
revset.reachableroots by introducing a C implementation. The main motivation is to
speed up smartlog on big repositories. At the end of the series, on our big
repositories the computation of reachableroots is 10-50x faster and smartlog on is
2x-5x faster.

This patch introduces a C implementation for reachableroots following closely the
Python implementation but optimized by using C data structures.

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