[libcxx-commits] [libcxx] [libc++] Use __datasizeof for __libcpp_datasizeof if available (PR #72104)

[Louis Dionne via libcxx-commits]

ldionne wrote:

You probably want to give a bit of time for @mordante to see this, but otherwise I think this is pretty uncontroversial once it runs on the right CI.

https://github.com/llvm/llvm-project/pull/72104