Revert r222363: "[clang-tidy] Count errors in ClangTidyDiagnosticConsumer"

This was causing clang-tidy invocations that would previously pass despite
source errors to fail.

llvm-svn: 222390

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp

@@ -277,9 +277,6 @@ void ClangTidyDiagnosticConsumer::finalizeLastError() {
 
 void ClangTidyDiagnosticConsumer::HandleDiagnostic(
     DiagnosticsEngine::Level DiagLevel, const Diagnostic &Info) {
-  // Count warnings/errors.
-  DiagnosticConsumer::HandleDiagnostic(DiagLevel, Info);
-
   if (DiagLevel == DiagnosticsEngine::Note) {
     assert(!Errors.empty() &&
            "A diagnostic note can only be appended to a message.");

clang-tools-extra/test/clang-tidy/clang-tidy-diff.cpp

@@ -6,7 +6,7 @@ struct A {
   virtual void f() {}
   virtual void g() {}
 };
-// CHECK-NOT: warning:
+// CHECK-NOT: warning
 struct B : public A {
   void placeholder_for_f() {}
 // CHECK-SANITY: [[@LINE-1]]:8: warning: Annotate this