RSRP-468792: Use Base Type: type after 'is' operator is not replaced with base type.

JetBrains ReSharper Ultimate 2018.1 EAP 4 D Build 12.0.20180321.063312-eap04d

        private bool GetUseBaseType()
        {
            var newType = new UseBaseType();
            var test2 = newType is UseBaseType;

            return new UseBaseType() is UseBaseType;
        }

Test solution is attached.

1. Invoke ReSharper -> Refactor -> Use Base Type Where Possible on UseBaseType after is operator.
2. In "Use Base Type Where Possible" check all checkboxes.
3. Click Next

Actual result:
UseBaseType is not replaced with Object.

Expected result:
UseBaseType is replaced with Object.

        private bool GetUseBaseType()
        {
            var newType = new UseBaseType();
            var test2 = newType is Object;

            return new UseBaseType() is Object;
        }