Removed an unfortunate cut and paste left-over.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66099 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaExprObjC.cpp

@@ -417,8 +417,6 @@ Sema::ExprResult Sema::ActOnInstanceMessage(ExprTy *receiver, Selector Sel,
         if (!Method) {
           Method = LookupInstanceMethodInGlobalPool(
                                    Sel, SourceRange(lbrac,rbrac));
-          if (Method)
-            Diag(receiverLoc, diag::warn_maynot_respond) << Sel;
         }
       }
     }