[libcxx-commits] [libcxx] [libc++] Make std::pair trivially copyable if its members are (PR #89652)

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EricWF wrote:

> However, in both cases it seemed to me that this would require an overhaul of the ABI selection mechanism and its documentation, which I have started looking into locally and for which https://github.com/llvm/llvm-project/commit/23e1ed65c2c3eb1f80f7eeb4897ec843492c5451 was the motivation.

We've supported this before. 


https://github.com/llvm/llvm-project/pull/89652