[clang] [llvm] [ARM][KCFI] Add backend support for Kernel Control-Flow Integrity (PR #163698)

[Kees Cook via cfe-commits]

kees wrote:

> ⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

Whoops! Yes, fixed now.

https://github.com/llvm/llvm-project/pull/163698