Avoid bin index validation in bin and group operations #3638
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Since bin indices were computed from bin sizes, validation of the indices is not necessary. On my computer this saves around 25 ms for 1M bins and 350 ms for 10M bins in calls to
group(probably similar forbin).The improvement from the second commit is less clear. Maybe around 10 ms for 10M bins. Might be more relevant in an environment with fewer threads.
Part of #3637.