[lldb] Print a message when background tasks take a while to complete…#8617

JDevlieghere merged 1 commit intoswift/release/6.0swiftlang/llvm-project:swift/release/6.0from

jdevlieghere/cherrypick-2f343fc1574f36b3b5ff1acf63407c53dcdac331swiftlang/llvm-project:jdevlieghere/cherrypick-2f343fc1574f36b3b5ff1acf63407c53dcdac331Copy head branch name to clipboard