Comment 7 for bug 1842730

There are some cases in the implementation of dlopen where _dl_signal_error is called without removing all partially-initialized link maps. The downstream bug report refers to an error raised from _dl_map_object in response to a missing file (the final call to _dl_signal_error). We do some cleanup, but it seems we skip removal of a NODELETE object.

It's not clear to me if we should complete the initialization of the NODELETE object, or somehow arrange that we are always in a situation in which we can remove the NODELETE object without observable effects if we have to. The latter probably means that we cannot start running constructors and IFUNCs until all objects in the current link operation have been found, mapped, and all required ld.so data structures have at least been allocated.