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

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EricWF wrote:

OK, so I think these "ABI" breaks are more benign that I initially thought, since itanium uses doesn't consider the assignment operators for the purposes of the calling convention. 

So I'm happy to unblock on this, though I'm curious now why we're treating this as an ABI break at all?
The bytes don't change meaning, and the calling conventions stay the same.

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