auto merge of #19561 : csouth3/rust/treeset-bitops, r=Gankro
Implement the `BitOr`, `BitAnd`, `BitXor`, and `Sub` traits from `std::ops` for TreeSet. The behavior of these operator overloads is consistent with [RFC 235](https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#combinations). r? @Gankro
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