Conditional breakpoints in LLDB do some stuff which I don't understand that ultimately trickles down to a call to RuntimeDyld::loadObject with a COFF object. Since this is unsupported, it leads to a report_fatal_error. We should get this working.
This is pretty old. What is the status of this?
There is actually a RuntimeDyldCOFF now. It's not complete, but if we have issues with it we should file specific bugs for those. I think we can call this fixed.