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89fe96197d
use funnel shift as fallback impl for rotating shifts That lets us remove this gnarly implementation from Miri and const-eval. However, `rotate_left`/`rotate_right` are stable as const fn, so to do this we have to `rustc_allow_const_fn_unstable` a bunch of const trait stuff. Is that a bad idea? Cc `@oli-obk` `@fee1-dead`