[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. Here specifically, this is making a use-case work which we're not supporting so far, so IMO this definitely requires and RFC.

RFC created: https://discourse.llvm.org/t/rfc-adding-requires-statement-in-split-buffer-h-for-compatibility-with-swift-compiler/89092

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