David Majnemer a32748ff23 Merging r222338: ... ------------------------------------------------------------------------ r222338 | majnemer | 2014-11-19 01:41:05 -0800 (Wed, 19 Nov 2014) | 16 lines AliasSetTracker: UnknownInsts should contribute to the refcount AliasSetTracker::addUnknown may create an AliasSet devoid of pointers just to contain an instruction if no suitable AliasSet already exists. It will then AliasSet::addUnknownInst and we will be done. However, it's possible for addUnknown to choose an existing AliasSet to addUnknownInst. If this were to occur, we are in a bit of a pickle: removing pointers from the AliasSet can cause the entire AliasSet to become destroyed, taking our unknown instructions out with them. Instead, keep track whether or not our AliasSet has any unknown instructions. This fixes PR21582. ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@223627 91177308-0d34-0410-b5e6-96231b3b80d8		2014-12-08 08:48:09 +00:00
..
llvm	Merging r222338:	2014-12-08 08:48:09 +00:00
llvm-c	Merging r214519:	2014-08-04 04:21:04 +00:00