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gh-151297: Fix undefined behavior in `_PyObject_MiRealloc` #266694

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gh-151297: Fix undefined behavior in `_PyObject_MiRealloc`

gh-151297: Fix undefined behavior in `_PyObject_MiRealloc` #266694

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Job	Run time
Unresolved review	6s
DO-NOT-MERGE	3s
	9s

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