Erik Eckstein 1d62d3481c SIL: fix a memory leak, related to zombie functions ...

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

2020-09-11 11:09:29 +02:00

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