I was able to solve the issue (temporarily) by switching back to Xcode 10.3.
These symbols are related to the new I/O Kit infrastructure needed to support DriverKit. I do not know enough this to offer any great insight, alas. If no one else chimes in, my recommendation is that you open a DTS tech support incident and talk with our DriverKit specialist.
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"