[llvm-commits] [PATCH] Do not attempt to destroy AttributesListImpl if already destroyed

[Peter Collingbourne]

Hi,

During static deinitialization, it is possible for AttributesLists to
be destroyed before GlobalContext.  This will cause the AttrListPtrs
held by Function and various Instruction subclasses to be invalidated.
Later when GlobalContext is destroyed the AttributesListImpls referred
to by the AttrListPtrs will be deleted, causing memory errors.
This patch causes AttributesListImpl to skip deinitialization via
DropRef if AttributesLists has been destroyed.

OK to commit?

Thanks,
-- 
Peter
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