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* Fix a use-after-free error in GlobalOpt CleanupConstantGlobalUsersHal Finkel2013-12-121-0/+32
GlobalOpt's CleanupConstantGlobalUsers function uses a worklist array to manage constant users to be visited. The pointers in this array need to be weak handles because when we delete a constant array, we may also be holding a pointer to one of its elements (or an element of one of its elements if we're dealing with an array of arrays) in the worklist. Fixes PR17347. llvm-svn: 197178
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