[llvm] [emacs] Add noext as an attribute in llvm-mode.el (PR #121444)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

Thanks.

I tried to merge it here, but I got a mail:

"LLVM Premerge Checks: All jobs have failed"
https://github.com/llvm/llvm-project/actions/runs/12585196983
@goldsteinn 

https://github.com/llvm/llvm-project/pull/121444