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/Frontend/warning-mapping-4.c b/clang/test/Frontend/warning-mapping-4.c
index d8d2769..6644042 100644
--- a/clang/test/Frontend/warning-mapping-4.c
+++ b/clang/test/Frontend/warning-mapping-4.c
@@ -1,5 +1,6 @@
 // RUN: %clang_cc1 -verify -Wno-error=sign-compare %s
 // RUN: %clang_cc1 -verify -Wsign-compare -w -Wno-error=sign-compare %s
+// expected-no-diagnostics
 
 int f0(int x, unsigned y) {
   return x < y;