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This time, also fix the caller of AddGlue to properly handle incomplete chains. AddGlue had failure modes, but shamefully hid them from its caller. It's luck ran out. Fixes rdar://11314175: BuildSchedUnits assert. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155749 91177308-0d34-0410-b5e6-96231b3b80d8