See the comment at updateSubstitutedMemberIfReceiverContainsTypeVariable
It became necessary after delegate inference is rewritten, since before
that happened, stub types were being left there and FIR2IR handled
them accidentally properly because stub types are equal to anything.
But that wasn't really correct even there because stub types are not
intended to leak out of the FIR
^KT-61060
This commit fixes DFA problem (see test) when we accidentally try
to merge incoming flows from member property (val ... by cached ...) and
the following function. While completing lambda of buildList { ... }
inside by cached we accidentally assume that delegate is already left
and add the lambda into exitsFromCompletedPostponedAnonymousFunction.
This commit fixes the problem by exiting delegate later, after completion.
Denis.Zharkov