[LTO] Handle null GV in Symbol object

Similar to other Symbol methods, have Symbol::getComdat handle
a null GV gracefully.

Fixes PR30326.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281134 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/LTO/LTO.h b/include/llvm/LTO/LTO.h
index d5f3b12..5b684bd 100644 (file)
--- a/include/llvm/LTO/LTO.h
+++ b/include/llvm/LTO/LTO.h
@@ -165,6 +165,8 @@ public:
       return GV && llvm::canBeOmittedFromSymbolTable(GV);
     }
     Expected<const Comdat *> getComdat() const {
+      if (!GV)
+        return nullptr;
       const GlobalObject *GO;
       if (auto *GA = dyn_cast<GlobalAlias>(GV)) {
         GO = GA->getBaseObject();