Add support for accessing field formal parameters in the initializer list of constructors

pkg/analyzer/lib/src/task/options.dart

Index: pkg/analyzer/lib/src/task/options.dart
diff --git a/pkg/analyzer/lib/src/task/options.dart b/pkg/analyzer/lib/src/task/options.dart
index dd544cad78c582c194604a63ad17fffc6c167d38..58d76ac5acb1d0bcb17ecdb04a1c9eab60ec9ca9 100644
--- a/pkg/analyzer/lib/src/task/options.dart
+++ b/pkg/analyzer/lib/src/task/options.dart
@@ -48,6 +48,8 @@ class AnalyzerOptions {
   static const String enableAssertInitializer = 'enableAssertInitializer';
   static const String enableAsync = 'enableAsync';
   static const String enableGenericMethods = 'enableGenericMethods';
+  static const String enableInitializingFormalAccess =
+      'enableInitializingFormalAccess';
   static const String enableStrictCallChecks = 'enableStrictCallChecks';
   static const String enableSuperMixins = 'enableSuperMixins';
 
@@ -566,6 +568,8 @@ class _OptionsProcessor {
         options.enableAssertInitializer = boolValue;
       } else if (feature == AnalyzerOptions.enableAsync) {
         options.enableAsync = boolValue;
+      } else if (feature == AnalyzerOptions.enableInitializingFormalAccess) {
+        options.enableInitializingFormalAccess = boolValue;
       } else if (feature == AnalyzerOptions.enableSuperMixins) {
         options.enableSuperMixins = boolValue;
       } else if (feature == AnalyzerOptions.enableGenericMethods) {