Prior to adding the new "expected-no-diagnostics" directive to VerifyDiagnosticConsumer, make the necessary adjustment to 580 test-cases which will henceforth require this new directive.

llvm-svn: 166280
diff --git a/clang/test/SemaObjC/ucn-objc-string.m b/clang/test/SemaObjC/ucn-objc-string.m
index 6070278..f80d1ff 100644
--- a/clang/test/SemaObjC/ucn-objc-string.m
+++ b/clang/test/SemaObjC/ucn-objc-string.m
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 %s -verify -fsyntax-only
+// expected-no-diagnostics
 @class NSString;
 extern void NSLog(NSString *format, ...) __attribute__((format(__NSString__, 1, 2)));