DDC/AnalyzerCLI common cmdline option processing

pkg/analyzer_cli/test/options_test.dart

Index: pkg/analyzer_cli/test/options_test.dart
diff --git a/pkg/analyzer_cli/test/options_test.dart b/pkg/analyzer_cli/test/options_test.dart
index 0a34dfc3375ad454a8b87e4dbc0c43e2eb8bd9f3..c0ca301e3a07695560dff70238ed27b4a9f6058d 100644
--- a/pkg/analyzer_cli/test/options_test.dart
+++ b/pkg/analyzer_cli/test/options_test.dart
@@ -55,11 +55,9 @@ main() {
 
       test('defined variables', () {
         CommandLineOptions options = CommandLineOptions
-            .parse(['--dart-sdk', '.', '-Dfoo=bar', '-Da', 'b', 'foo.dart']);
+            .parse(['--dart-sdk', '.', '-Dfoo=bar', 'foo.dart']);
         expect(options.definedVariables['foo'], equals('bar'));
         expect(options.definedVariables['bar'], isNull);
-        expect(options.definedVariables['a'], equals('b'));
-        expect(options.definedVariables['b'], isNull);
       });
 
       test('disable cache flushing', () {