Fix crash on follow_imports_for_stubs #15407
Merged
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Fixes #15246
Likely fixes #15319, but I didn't find a repro.
Note I also cleanup one thing, there should be clear separation:
CORE_BUILTIN_MODULES
must be always available, and their content must be unaltered, since we rely on it.semanal_main.core_modules
should be analyzed first amongbuiltins
SCC in a specific order.