[clang] [llvm] [X86] Enhance kCFI type IDs with a 3-bit arity indicator. (PR #117121)

[Miguel Ojeda via cfe-commits]

ojeda wrote:

> looks like rust is already tracking and willing to support it? [Rust-for-Linux/linux#1132](https://github.com/Rust-for-Linux/linux/issues/1132) (thanks @ojeda)

You're welcome! Just in case: if the question is about the entry I added today, then that entry is intended to track this PR, the potential consequences/needs for the Rust support in the kernel, related work/links, etc., but it does not imply Rust is tracking it or that they are willing to support it already.

https://github.com/llvm/llvm-project/pull/117121