Fix bugs in cycle_count and hash_map - #97
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This PR fixes several bugs under parlay/examples,
cycle_count.h
(p<p) + (p<=p) == 1, so it never becomes a leaf and is dropped from the count.hash_map.h
findstops probing at any non-fullslot, including tombstones, whileinsertstores keys past the tombstones — so a live key can become unfindable after an unrelated removal on its probe path.