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Use sys.modules.get() in the "with _ModuleLockManager(name):" block
to protect the dictionary key with the module lock and use an atomic
get to prevent race condition.
Remove also _bootstrap._POPULATE since it was unused
(_bootstrap_external now has its own _POPULATE object), add a new
_SENTINEL object instead.
(cherry picked from commit
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|---|---|---|
| .. | ||
| __init__.py | ||
| _bootstrap.py | ||
| _bootstrap_external.py | ||
| abc.py | ||
| machinery.py | ||
| util.py | ||