[llvm] [SystemZ] Add proper mcount handling (PR #135767)

[Dominik Steenken via llvm-commits]

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@@ -558,6 +559,32 @@ void SystemZELFFrameLowering::emitPrologue(MachineFunction &MF,
   // to determine the end of the prologue.
   DebugLoc DL;
 
+  // Add mcount instrumentation if necessary.
+  if (MF.getFunction().getFnAttribute("systemz-backend").getValueAsString() ==
+      "insert-mcount") {
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dominik-steenken wrote:

I have renamed the attribute as requested.

https://github.com/llvm/llvm-project/pull/135767