(Wangle) Simplify reduce, use the same implementation for func returning T/Future<T>
Summary: I wanted to use `collectAll` for `reduce` if `func` does not return a Future, because the overhead seemed smaller, but it has been suggested that running the callback as soon as possible might be better. Not sure which is. Note that this also makes n copies of the lambda and moves the value at least n times. I also plan to add a `streamingReduce` which calls `func` as soon as results come in (but out of order). Test Plan: Run all the tests. Reviewed By: hans@fb.com Subscribers: folly-diffs@, jsedgwick, yfeldblum, chalfant FB internal diff: D2015316 Tasks: 6025252 Signature: t1:2015316:1430349611:4f62a540ded85299a22670dd2add27cf1458e8f8
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