Report WRN_UninitializedNonNullableField warnings for static fields.

[AlekseyTs]

        // PROTOTYPE(NullableReferenceTypes): Report warnings for static fields.
        [Fact]
        public void StaticFields_DefaultConstructor()
        {
            var source =
@"class C
{
#pragma warning disable 0169
    private static object F1;
    private static object F2 = new object();
    private readonly static object F3;
    private readonly static object F4 = new object();
}";
            var comp = CreateCompilation(new[] { source, NonNullTypesTrue, NonNullTypesAttributesDefinition }, parseOptions: TestOptions.Regular8);
            comp.VerifyDiagnostics();
                //// (8,12): warning CS8618: Non-nullable field 'F3' is uninitialized.
                ////     static C()
                //Diagnostic(ErrorCode.WRN_UninitializedNonNullableField, "C").WithArguments("field", "F3").WithLocation(8, 12),
                //// (8,12): warning CS8618: Non-nullable field 'F1' is uninitialized.
                ////     static C()
                //Diagnostic(ErrorCode.WRN_UninitializedNonNullableField, "C").WithArguments("field", "F1").WithLocation(8, 12));
        }

        // PROTOTYPE(NullableReferenceTypes): Report warnings for static fields.
        [Fact]
        public void StaticFields_ExplicitConstructor()
        {
            var source =
@"class C
{
#pragma warning disable 0169
    private static object F1;
    private static object F2;
    private readonly static object F3;
    private readonly static object F4;
    static C()
    {
        F2 = new object();
        F4 = new object();
    }
}";
            var comp = CreateCompilation(new[] { source, NonNullTypesTrue, NonNullTypesAttributesDefinition }, parseOptions: TestOptions.Regular8);
            comp.VerifyDiagnostics();
                //// (8,12): warning CS8618: Non-nullable field 'F3' is uninitialized.
                ////     static C()
                //Diagnostic(ErrorCode.WRN_UninitializedNonNullableField, "C").WithArguments("field", "F3").WithLocation(8, 12),
                //// (8,12): warning CS8618: Non-nullable field 'F1' is uninitialized.
                ////     static C()
                //Diagnostic(ErrorCode.WRN_UninitializedNonNullableField, "C").WithArguments("field", "F1").WithLocation(8, 12));
        }

[PathogenDavid]

I believe this is a duplicate of #27014.

[cston]

Closing as a duplicate of #34668.