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

[Alice Ryhl via cfe-commits]

Darksonn wrote:

> AFAIK the use case for KCFI is very narrow: the x86-64 Linux kernel.

At the very least, it's also used in the arm64 Linux Kernel.

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