Add parallel arrays shape for dictionaries and hashsets - #152
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Part of #149.
Adds the parallel arrays shape of dictionaries and hash sets to the collection readers. The oldest Mono corlib, net20 on Unity 5.6, lays a dictionary out as
linkSlots,keySlots,valueSlotsandtouchedSlots, and a set aslinks,slotsandtouched. The offsets resolvers recognize that shape, and the same read calls read it. The read walks the links up to the high-water mark, takes the indices whose stored hash carries the live flag, and reads the key and value arrays at those indices. TheLinkclass says which of its two ints is the hash, so either order works.Nothing changes on the surface. The offsets types carry a shape inside.
cargo test --all-featuresruns the suite. The new tests cover parallel dictionaries and hash sets on both runtimes and unbalanced parallel tallies.Depends on #151.