diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp
index 0450c35..c34b628 100644
--- a/lib/CodeGen/LiveInterval.cpp
+++ b/lib/CodeGen/LiveInterval.cpp
@@ -629,6 +629,12 @@
       UnusedValNo = 0;
     }
   }
+
+  if (UnusedValNo) {
+    // Delete the last unused val#.
+    valnos.pop_back();
+    UnusedValNo->~VNInfo();
+  }
 }
 
 void LiveInterval::MergeInClobberRange(unsigned Start, unsigned End,