[lldb/Reproducers] Add a small artificial delay before exiting

Add a small artificial delay in replay mode before exiting to ensure
that all asynchronous events have completed. This should reduce the
level of replay flakiness on some of the slower bots.

Author: JDevlieghere

lldb/source/Utility/ReproducerInstrumentation.cpp

@@ -8,6 +8,7 @@
 
 #include "lldb/Utility/ReproducerInstrumentation.h"
 #include "lldb/Utility/Reproducer.h"
+#include <thread>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -94,6 +95,10 @@ bool Registry::Replay(llvm::StringRef buffer) {
     GetReplayer(id)->operator()(deserializer);
   }
 
+  // Add a small artificial delay to ensure that all asynchronous events have
+  // completed before we exit.
+  std::this_thread::sleep_for (std::chrono::milliseconds(100));
+
   return true;
 }