[libcxx-commits] [libcxx] [libc++] Fix triviality of std::pair for trivially copyable types without an assignment operator (PR #95444)

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h-vetinari wrote:

> While this is not technically an ABI break, in practice we do know that folks sometimes use a different representation based on whether a type is trivially copyable. So we're treating [83ead2b](https://github.com/llvm/llvm-project/commit/83ead2bbc5e14ca1beb776c062ebc36c38e8bb1c) as an ABI break and this patch is fixing said breakage.

Should this then also target 18.1.8 (if it materializes)?

https://github.com/llvm/llvm-project/pull/95444