[llvm] [Patchpoint] Add immarg attributes to patchpoint arguments (PR #97276)

[Csanád Hajdú via llvm-commits]

Il-Capitano wrote:

Thanks for the review!

> Could use coverage in test/Verifier/intrinsic-immarg.ll

I added a test case in the latest change.

https://github.com/llvm/llvm-project/pull/97276