[clang] [llvm] [CodeGen][KCFI] Allow setting type hash from xxHash64 to FNV-1a (PR #167254)

[Kees Cook via llvm-commits]

kees wrote:

> This breaks `ARCH=arm64 allmodconfig`:
> 
> ```
> $ make -skj"$(nproc)" ARCH=arm64 LLVM=1 clean allmodconfig ipc/ipc_sysctl.o
> <inline asm>:6:55: error: expected newline
>     6 | .set __kcfi_typeid_proc_doulongvec_minmax, 3439065979 # -855901317
>       |                                                       ^
> <inline asm>:8:53: error: expected newline
>     8 | .set __kcfi_typeid_proc_dointvec_minmax, 3439065979 # -855901317
>       |                                                     ^
> 2 errors generated.
> make[5]: *** [scripts/Makefile.build:287: ipc/ipc_sysctl.o] Error 1
> ...
> ```

Argh. Does aarch64 use a different asm comment character?

https://github.com/llvm/llvm-project/pull/167254