prefer_const_constructors: false positive in tenrary expression

[Pante]

Describe the issue
When trying to create a const object in a ternary expression, both parts must either be const or non-const. Having a mix will result in a compilation error.

To Reproduce

class A<T> {
  const A();
}

class B<T> extends A<T> {
  B();
}

A<T> foo<T>(bool flag) => flag ? A() : B(); // warns that A() should be const

A<T> foo<T>(bool flag) => flag ? const A() : B(); // compile error: A value of type 'Object' can't be returned from the function 'foo' because it has a return type of 'A<T>'

Expected behavior
No warning

Additional context
I'm unsure if this is related to #3802.

[lrhn]

Adding the const changes the type of the literal from A<T> to A<Never>.
That itself suggests that the lint might be out of place.

The error then comes from A<Never> and B<T> not having any shared superintetface below Object.

[srawlins]

Fixed with dart-lang/sdk@f15bcc9