fix pr2460

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52294 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/VMCore/Instructions.cpp b/lib/VMCore/Instructions.cpp
index a49f6a564c217c4afbfc3ceaa5f2193655ea3ee2..80a24f9ff9f3a83e4a5784692494002253a4a9ff 100644 (file)
--- a/lib/VMCore/Instructions.cpp
+++ b/lib/VMCore/Instructions.cpp
@@ -130,7 +130,8 @@ PHINode::PHINode(const PHINode &PN)
 }
 
 PHINode::~PHINode() {
-  dropHungoffUses(OperandList);
+  if (OperandList)
+    dropHungoffUses(OperandList);
 }
 
 // removeIncomingValue - Remove an incoming value.  This is useful if a