[java] False positive for UseInstanceofToCompareClasses on local generic class

UseInstanceofToCompareClasses reports on non-reifiable types, even though they're not acceptable as operand to instanceof. E.g.:

class Foo<T> {

public Foo<T> wrap() {
   // since the local class is not static, the T here refers to the T of the outer instance
   class MyWrapper extends Foo<T> {
      
   }
   this instanceof MyWrapper // -> error, MyWrapper is not reifiable, because its supertype Foo<T> isn't 

   this.getClass().equals(MyWrapper.class) // this is the only way to compare it
} 

}

Start by locating the UseInstanceofToCompareClasses rule and reproduce the provided local generic-class example. Check how the rule determines whether the instanceof operand is valid, then verify that this non-reifiable MyWrapper case is ignored while valid comparisons still produce findings.