Prefer addAttr(Attribute::AttrKind) over the AttributeList overload

This should simplify the call sites, which typically want to tweak one
attribute at a time. It should also avoid creating ephemeral
AttributeLists that live forever.

llvm-svn: 300718
diff --git a/clang/lib/CodeGen/CGObjC.cpp b/clang/lib/CodeGen/CGObjC.cpp
index 357d1ab..76e7df8 100644
--- a/clang/lib/CodeGen/CGObjC.cpp
+++ b/clang/lib/CodeGen/CGObjC.cpp
@@ -1850,12 +1850,8 @@
       F->addFnAttr(llvm::Attribute::NonLazyBind);
     }
 
-    if (IsForwarding(Name)) {
-      llvm::AttrBuilder B;
-      B.addAttribute(llvm::Attribute::Returned);
-
-      F->arg_begin()->addAttr(llvm::AttributeList::get(F->getContext(), 1, B));
-    }
+    if (IsForwarding(Name))
+      F->arg_begin()->addAttr(llvm::Attribute::Returned);
   }
 
   return RTF;