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

[Anatoly Trosinenko via llvm-commits]

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@@ -199,6 +200,12 @@ class ExegesisAArch64Target : public ExegesisTarget {
     PM.add(createAArch64ExpandPseudoPass());
   }
 
+  // Converts variadic arguments to `long` and passes zeros for the unused
+  // arg2-arg5, as tested by the Linux kernel.
+  static long prctl_wrapper(int op, long arg2 = 0, long arg3 = 0) {
+    return prctl(op, arg2, arg3, /*arg4=*/0L, /*arg5=*/0L);
+  }
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atrosinenko wrote:

Please surround this in `#if ... #endif`, as otherwise compilation fails for non-AArch64 systems.

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