Alastair Houghton 6f8b2ef9e5 [Runtime] Fix swift_weakTakeStrong(). ...

It turns out that when taking the last weak reference for an object that
has been deallocated, we might have returned a non-null pointer when we
shouldn't have.  Which is exciting.

rdar://106375185

2023-04-14 19:15:38 +01:00

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