add rdar # I accidentally lost.

llvm-svn: 83942

clang/test/Sema/unused-expr.c

@@ -83,7 +83,7 @@ void t5() {
 int fn1() __attribute__ ((warn_unused_result));
 int fn2() __attribute__ ((pure));
 int fn3() __attribute__ ((const));
-
+// rdar://6587766
 int t6() {
   if (fn1() < 0 || fn2(2,1) < 0 || fn3(2) < 0)  // no warnings
     return -1;