we should not execute memory which got allocated using malloc
(crashes a lot of memory inspection tools and also the windows subsystem for linux)
I replaced it with a trivial mmap allocator which never unmaps the memory
(but reuses the memory if a runtime ICs gets deleted)
I think this is fine for now:
- there are <100 runtime ICs used per test
- because all runtime ICs have the same size there is no problem with fragmentation