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1d62d3481c
The leak happened in this scenario: 1. A function becomes dead and gets deleted (which means: it gets added to the zombie-list) 2. A function with the same name is created again. This can happen with specializations. In such a case we just removed the zombie function from the zombie-list without deleting it. But we cannot delete zombie functions, because they might still be referenced by metadata, like debug-info. Therefore the right fix is to resurrect the zombie function if a new function is created with the same name. rdar://problem/66931238