Fix sem.unknown_function.spawn handling in base
#1603
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Now that #1029 is done for a while, we can remove a hack in base whereby
sem.unknown_function.spawndidn't just apply to unknown functions (like it was supposed to), but all library functions with spawning arguments as well.The consequence is that
atexitneeds a separate option as planned by #1174 (comment).This requires some generalization of the library function DSL to allow options to control the argument access of a library function.
This makes us also more sound in SV-COMP where there are some instances of
atexitthat we currently completely ignored. Betteratexithandling is the goal of #799.