[clang] [libcxx] [clang & libcxx] constexpr pointer tagging (DO NOT MERGE) (PR #111861)

[Louis Dionne via cfe-commits]

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https://github.com/ldionne commented:

Thanks a lot, I think this is a really promising proposal. I would love to have something like that in the standard library.

I think the main thing that's still missing here is the ability to compose tagged pointers, like LLVM PointerIntPair does.

https://github.com/llvm/llvm-project/pull/111861