CodeGen: Weak reference temporaries belong in a COMDAT

llvm-svn: 229902

clang/lib/CodeGen/CodeGenModule.cpp

@@ -3104,6 +3104,8 @@ llvm::Constant *CodeGenModule::GetAddrOfGlobalTemporary(
   setGlobalVisibility(GV, VD);
   GV->setAlignment(
       getContext().getTypeAlignInChars(MaterializedType).getQuantity());
+  if (supportsCOMDAT() && GV->isWeakForLinker())
+    GV->setComdat(TheModule.getOrInsertComdat(GV->getName()));
   if (VD->getTLSKind())
     setTLSMode(GV, *VD);
   Slot = GV;