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

[Abhilash Majumder via llvm-commits]

abhilash1910 wrote:

Looking at the error log, it seems that it is disabling pac (on some systems) without checking if the keys are present/accessible through prctl() . A solution can be to check prior if pac is available in the system and then to disable it . 

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