[llvm] [InitUndef] Also handle inline asm (PR #108951)

[Jack Styles via llvm-commits]

https://github.com/Stylie777 commented:

Could we get some tests that cover the inline asm cases for Arm? Something testing the `vcaddq` similar to those added in #77770 would be great. 

https://github.com/llvm/llvm-project/pull/108951