[libcxx-commits] [libcxx] Fix __split_buffer_pointer_layout compatibility with swift's C++ interop (PR #170957)

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junov-google wrote:

> We generally require testing for changes. 

I tried really hard to find a way to test this but I have not found a way that does not have the swift compiler in the loop. The "requires" constraint does not appear to have any observable effects in pure C++ builds.  Are we okay with only having tests for this in the downstream (swift-project) repo?


https://github.com/llvm/llvm-project/pull/170957