[llvm] r278438 - Add comment /NFC

[Xinliang David Li via llvm-commits]

Author: davidxl
Date: Thu Aug 11 18:09:56 2016
New Revision: 278438

URL: http://llvm.org/viewvc/llvm-project?rev=278438&view=rev
Log:
Add comment /NFC

Modified:
    llvm/trunk/lib/Analysis/AliasSetTracker.cpp

Modified: llvm/trunk/lib/Analysis/AliasSetTracker.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/AliasSetTracker.cpp?rev=278438&r1=278437&r2=278438&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/AliasSetTracker.cpp (original)
+++ llvm/trunk/lib/Analysis/AliasSetTracker.cpp Thu Aug 11 18:09:56 2016
@@ -468,8 +468,9 @@ void AliasSetTracker::copyValue(Value *F
   AliasSet::PointerRec &Entry = getEntryFor(To);
   if (Entry.hasAliasSet()) return;    // Already in the tracker!
 
-  // Add it to the alias set it aliases...
+  // getEntryFor above may invalidate iterator \c I, so reinitialize it.
   I = PointerMap.find_as(From);
+  // Add it to the alias set it aliases...
   AliasSet *AS = I->second->getAliasSet(*this);
   AS->addPointer(*this, Entry, I->second->getSize(),
                  I->second->getAAInfo(),