[llvm] [llvm-exegesis][AArch64] Check for PAC keys before disabling them (PR #138643)

[Anatoly Trosinenko via llvm-commits]

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@@ -32,6 +39,53 @@
 namespace llvm {
 namespace exegesis {
 
+static cl::opt<bool> AArch64DisablePacControl(
+    "aarch64-disable-pac-control",
+    cl::desc("Disable PAC key control at runtime for benchmarking. Use this if "
+             "llvm-exegesis crashes or instruction timings are affected."),
+    cl::init(false));
+
+bool isPointerAuth(unsigned Opcode) {
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atrosinenko wrote:

Can be `static`.

https://github.com/llvm/llvm-project/pull/138643