Check for null MDNode element while printing comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83172 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/VMCore/AsmWriter.cpp b/lib/VMCore/AsmWriter.cpp
index fbd62dd0728e311f767d1f54e22ed0e8dbeb2be3..34ce7bb9964137b490752217e83d2b78a0a5e67e 100644 (file)
--- a/lib/VMCore/AsmWriter.cpp
+++ b/lib/VMCore/AsmWriter.cpp
@@ -874,7 +874,7 @@ static void WriteMDNodeComment(const MDNode *Node,
                               formatted_raw_ostream &Out) {
   if (Node->getNumElements() < 1)
     return;
-  ConstantInt *CI = dyn_cast<ConstantInt>(Node->getElement(0));
+  ConstantInt *CI = dyn_cast_or_null<ConstantInt>(Node->getElement(0));
   if (!CI) return;
   unsigned Val = CI->getZExtValue();
   unsigned Tag = Val & ~LLVMDebugVersionMask;