[llvm] Revert "[llvm-exegesis][AArch64] Disable pauth and ldgm as unsupported instructions fixed (#136868)" (PR #142382)

[Tom Stellard via llvm-commits]

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

I'm in favor of reverting this.  The test has been failing for over a month, and I think it's better to revert while the fix is still being worked on.

https://github.com/llvm/llvm-project/pull/142382