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Rollup merge of rust-lang#67725 - ssomers:into_key_slice_mut, r=RalfJung
Simplify into_key_slice_mut Remove a rare and tiny but superfluous run-time check from into_key_slice_mut. In rust-lang#67459, I wrote that "`get_mut` [...] does visit `into_key_slice_mut`" and that was wrong. No function that operates on a map that (still) has a shared root ever dives into `into_key_slice_mut`. So it's more clear to remove the (previously existing, and always incomplete) code it has for dealing with shared roots, as well as a petty performance improvement for those using exotically aligned key types. ~~Also, some testing of the `range` function initially added to rust-lang#67686 but hardly related.~~ r? @RalfJung
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