mrocklin / dask / 1280

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Pass dependencies through optimizations

This makes cull and fuse, two very common optimizations, return a
second ``dependencies`` result that is a frequently reused side effect
of the computation.  Dask.array was recreating this fairly expensive
data five times for a single optimization pass.

This is bad because it complicates optimizations.  This is good
because it halves total optimization time in some cases.

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8397 of 8980 relevant lines covered (93.51%)

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