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compiler: upgrade to hashbrown 0.16.1 See also rust-lang/rust#135634, rust-lang/rust#149159, and rust-lang/hashbrown#662. This includes an in-tree upgrade of `indexmap` as well, which uses the new `HashTable` buckets API internally, hopefully impacting performance for the better. And finally, we can remove `#[rustc_unsafe_specialization_marker]` on `Copy`! cc @joboet r? @Amanieu