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gh-151297: Fix undefined behavior in `_PyObject_MiRealloc` #266702

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gh-151297: Fix undefined behavior in `_PyObject_MiRealloc`

gh-151297: Fix undefined behavior in `_PyObject_MiRealloc` #266702

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Job	Run time
Unresolved review	4s
DO-NOT-MERGE	4s
	8s

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