fix crash in the case when some arg is null

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62236 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/VMCore/AsmWriter.cpp b/lib/VMCore/AsmWriter.cpp
index cd4c6921d2e2e10b91116f3cefbc52e017de414b..8139e822ee6ee1dc52c098fe8e6f4b8d19e175f6 100644 (file)
--- a/lib/VMCore/AsmWriter.cpp
+++ b/lib/VMCore/AsmWriter.cpp
@@ -1671,7 +1671,7 @@ void AssemblyWriter::printInstruction(const Instruction &I) {
     } else {
       for (unsigned i = 1, E = I.getNumOperands(); i != E; ++i) {
         Operand = I.getOperand(i);
-        if (Operand->getType() != TheType) {
+        if (Operand && Operand->getType() != TheType) {
           PrintAllTypes = true;    // We have differing types!  Print them all!
           break;
         }