Egor Zhdan 3a200deee9 [cxx-interop] Add UnsafeCxxContiguousIterator & UnsafeCxxMutableContiguousIterator protocols ...

This adds a pair of Swift protocols that represents C++ iterator types conforming to `std::contiguous_iterator_tag` requirements. These are random access iterators that guarantee that the values are stored in consequent memory addresses.

This will be used to optimize usage of C++ containers such as `std::vector` from Swift, for instance, by providing an overload of `withContiguousStorageIfAvailable` for contiguous containers.

rdar://137877849

2024-10-15 14:30:09 +01:00

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