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rollup merge of rust-lang#19216: Gankro/bitv
Part of rust-lang#18424 This commit changes the semantics of `reserve` and `capacity` for Bitv and BitvSet to match conventions. It also introduces the notion of `reserve_index` and `reserve_index_exact` for collections with maximum-index-based capacity semantics. Deprecates free function constructors in favour of functions on Bitv itself. Changes `Bitv::pop` to return an Option rather than panicking. Deprecates and renames several methods in favour of conventions. Marks several blessed methods as unstable. This commit also substantially refactors Bitv and BitvSet's implementations. The new implementation is simpler, cleaner, better documented, and more robust against overflows. It also reduces coupling between Bitv and BitvSet. Tests have been seperated into seperate submodules. Fixes rust-lang#16958 [breaking-change]
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