Subclasses implementing a final field with a getter confuses ddc

[jacob314]

Repro

abstract class Injector {
  final Injector parent = null;
...
}

class MyInjector extends Injector {
  /* severe: InvalidFieldOverride */ Injector get parent => null;
}

[sigmundch]

yeah, I believe we should get rid of all "InvalidFieldOverride", those come from the old type system, before we knew that we would just use JS getters to implement Dart getters. We should no longer need this check.

I'll go ahead and remove it.

[sigmundch]

fixed in a07cad7