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

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM (carrying over from the last patch).

Were you able to reproduce the issue locally?

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