[libcxx-commits] [libcxx] [libc++] Adds shared resource helper. (PR #72529)

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EricWF wrote:

This abstraction is scary & heavy weight. Why do we need a generic version of it?

I wouldn't be comfortable proceeding with this change until I understand where and how it's going to be used, and I see it used in real code. I'm very uncomfortable adding utility code without users. 

I don't need this change to contain the changes which use it, but I would like to see it before this proceeds.

https://github.com/llvm/llvm-project/pull/72529