I saw `testBackgroundIndexingHappensWithLowPriority` hang once. This should help us determine where we are hanging if we see the hang again. rdar://143303256
InternalImportsByDefault
build/taskStart
build/taskProgress
build/taskFinish
AsyncQueue<Serial>
SourceKitLSP
SKSupport
LanguageServerProtocolExtensions
PrefixMessageWithTaskEmoji.swift
SKCore
BuildSystemIntegration