Make the exit code for dartanalyzer more deterministic.

pkg/analyzer_cli/lib/src/options.dart

Index: pkg/analyzer_cli/lib/src/options.dart
diff --git a/pkg/analyzer_cli/lib/src/options.dart b/pkg/analyzer_cli/lib/src/options.dart
index f4bff0ce1089c8992b3a6fa31daa6747d9646495..90db6efe822039cedd6cd88f061f42673b6db802 100644
--- a/pkg/analyzer_cli/lib/src/options.dart
+++ b/pkg/analyzer_cli/lib/src/options.dart
@@ -144,6 +144,8 @@ class CommandLineOptions {
   /// Whether implicit dynamic is enabled (mainly for strong mode users)
   final bool implicitDynamic;
 
+  // TODO(devoncarew): Do we need this flag? Shouldn't we go by the severity of
+  // the lint?
   /// Whether to treat lints as fatal
   final bool lintsAreFatal;