[frontend] Address feedback by Jordan

Author: akyrtzi

lib/AST/DiagnosticEngine.cpp

@@ -250,7 +250,7 @@ bool DiagnosticEngine::isDiagnosticPointsToFirstBadToken(DiagID ID) const {
 bool DiagnosticEngine::finishProcessing() {
   bool hadError = false;
   for (auto &Consumer : Consumers) {
-    hadError =  Consumer->finishProcessing() || hadError;
+    hadError |= Consumer->finishProcessing();
   }
   return hadError;
 }

lib/FrontendTool/FrontendTool.cpp

@@ -341,7 +341,7 @@ class JSONFixitWriter
       DiagnosticEngine DE(dummyMgr);
       PrintingDiagnosticConsumer PDC;
       DE.addConsumer(PDC);
-      DE.diagnose(SourceLoc(), diag::cannot_open_serialized_file,
+      DE.diagnose(SourceLoc(), diag::cannot_open_file,
                   FixitsOutputPath, EC.message());
       return true;
     }