getEntryFor() may invalidate DenseMap iterator.

Walking an invalidated iterator is not a good idea.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68047 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/AliasSetTracker.cpp

@@ -520,6 +520,7 @@ void AliasSetTracker::copyValue(Value *From, Value *To) {
   if (Entry.hasAliasSet()) return;    // Already in the tracker!
 
   // Add it to the alias set it aliases...
+  I = PointerMap.find(From);
   AliasSet *AS = I->second->getAliasSet(*this);
   AS->addPointer(*this, Entry, I->second->getSize(), true);
 }