x86_64-win: Enable f128 on LLVM 23+ LLVM23 includes the ABI fix to make f128 work [1]. That version isn't yet stable, but at least the type will start getting picked up in top-of-tree CI. While addressing this, also update the comment regarding f16. [1]: https://github.com/llvm/llvm-project/commit/aa47e59245e24edb6d0c7d5f91b3a1c5a7bb35f1
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