clarify a comment, thanks Duncan.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46313 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 6ce29fb89f..fc393e9ef2 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -607,8 +607,9 @@ void DAGCombiner::Run(bool RunningAfterLegalize) {
         AddToWorkList(RV.Val);
         AddUsersToWorkList(RV.Val);
         
-        // Add any uses of the old node to the worklist if they have a single
-        // use.  They may be dead after this node is deleted.
+        // Add any uses of the old node to the worklist in case this node is the
+        // last one that uses them.  They may become dead after this node is
+        // deleted.
         for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
           AddToWorkList(N->getOperand(i).Val);