[BOLT][NFC] Add BOLTError and return it from passes (1/2) #81522
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As part of the effort to refactor old error handling code that
would directly call exit(1), in this patch we add a new class
BOLTError and auxiliary functions
createFatalBOLTError()
andcreateNonFatalBOLTError()
that allow BOLT code to bubble up theproblem to the caller by using the Error class as a return
type (or Expected). Also changes passes to use these.
Co-authored-by: Rafael Auler [email protected]
Test Plan: NFC