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Revert commits:
gh-151593: Fix dead lock in PyDict insert_split_key() (#152200)
gh-150490: Raise PyType_Modified for insertion into split dictionary (#150489)
For gh-150489, it violates locking discipline and results in deadlocks,
gh-151593 is an example of it being hit in CI. The attempted fix
gh-152200 avoids the deadlock but introduces a data-race. The race
window is small but can be triggered with pure Python code.
Source files for various builtin objects