[lldb] Fix -Wformat warning after 5a27b99

No functional changes intended.

(cherry picked from commit ad709bc)

Author: krasimirgg

lldb/source/Core/Debugger.cpp

@@ -1858,7 +1858,7 @@ void Debugger::HandleProgressEvent(const lldb::EventSP &event_sp) {
   // Print the progress message.
   std::string message = data->GetMessage();
   if (data->GetTotal() != UINT64_MAX) {
-    output.Printf("[%llu/%llu] %s...", data->GetCompleted(), data->GetTotal(),
+    output.Printf("[%" PRIu64 "/%" PRIu64 "] %s...", data->GetCompleted(), data->GetTotal(),
                   message.c_str());
   } else {
     output.Printf("%s...", message.c_str());