Make initializing formal access available by default

pkg/compiler/lib/src/commandline_options.dart

Index: pkg/compiler/lib/src/commandline_options.dart
diff --git a/pkg/compiler/lib/src/commandline_options.dart b/pkg/compiler/lib/src/commandline_options.dart
index 8d7b73589a3d6c02c21ff832e0bcf7453b8d08b5..81248d9ff8206e6d7a94012391f9f076baeb9973 100644
--- a/pkg/compiler/lib/src/commandline_options.dart
+++ b/pkg/compiler/lib/src/commandline_options.dart
@@ -74,9 +74,12 @@ class Flags {
   // https://gist.github.com/eernstg/4353d7b4f669745bed3a5423e04a453c.
   static const String genericMethodSyntax = '--generic-method-syntax';
 
+  // Initializing-formal access is enabled by default and cannot be disabled.
+  // For backward compatibility the option is still accepted, but it is ignored.
+  static const String initializingFormalAccess = '--initializing-formal-access';
+
   // Experimental flags.
   static const String resolveOnly = '--resolve-only';
-  static const String initializingFormalAccess = '--initializing-formal-access';
 }
 
 class Option {