NeedsInvestigationPerformancecompiler/runtimehelp wanted
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描述
This is a minor optimization opportunity. runtime.selectgo typically does a shuffle of a fairly small number of channels. https://lemire.me/blog/2024/08/17/faster-random-integer-generation-with-batching/ introduces an optimization for such shuffles. It might be worth incorporating the technique into selectgo. (math/rand/v2 is probably not possible due to backwards compat.)