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gh-151297: Fix undefined behavior in `_PyObject_MiRealloc` #266703

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gh-151297: Fix undefined behavior in `_PyObject_MiRealloc`

gh-151297: Fix undefined behavior in `_PyObject_MiRealloc` #266703

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Job	Run time
DO-NOT-MERGE	3s
Unresolved review	5s
	8s

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