Revert "[llvm-exegesis][AArch64] Disable pauth and ldgm as unsupported instructions fixed (#136868)" (#142382)
This reverts commit 475531b884a1a203af6367df35f1722fe2383e06. But it
does not revert the changes from commits
36850a028d149467cafd2702bc0c2587f6b71cce and
5dc3cd0ee40c00d9fb542488fa5a54ff70273112.