[llvm] [BOLT] Add itrace aggregation for AUX data (PR #70426)

[via llvm-commits]

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@@ -155,6 +160,8 @@ void DataAggregator::findPerfExecutable() {
 }
 
 void DataAggregator::start() {
+  std::string ItracePerfScriptArgs;
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maksfb wrote:

Is there a reason to declare `ItracePerfScriptArgs` in this scope?

https://github.com/llvm/llvm-project/pull/70426