[llvm] [llvm-exegesis][AArch64] Disable pauth and ldgm as unsupported instructions fixed (PR #136868)

[David Green via llvm-commits]

https://github.com/davemgreen approved this pull request.

LGTM to me still. We will have to see if this still has some issues with the buildbots, if we do then we will perhaps need to make it simpler or adjust it via a cmake option. Good luck!

https://github.com/llvm/llvm-project/pull/136868