https://reviews.llvm.org/D116787 This reverts commit 33b3c86afab06ad61d46456c85c0b565cfff8287. New change: fixed build failures: - in stabs-sorted:restore the the ERR-KEY statements, which were accidentally deleted during refactoring - in ObjDumper.h/MachODumper.cpp: refactor so that current dumpers which didn't provide an impl that accept a SymCom still works