False positive with the late keyword when using const factory constructor

[rrousselGit]

Consider the following code:

class Base {
  Base();

  const factory Base.empty() = _Empty;

  late final property = ...
}

class _Empty implements Base {
  const _Empty();

  @override
  get property => ...
}

This code currently does not compile with "Can't have a late final field in a class with a const constructor.
Try removing the 'late' modifier, or don't declare 'const' constructors."

This error is caused by a const factory. But since this is a factory constructor, this should not have any impact.

[eernstg]

True. Considering the issue in #1764.

[eernstg]

Done in #1764.