Handle instanceof of entire classes

[dcodeIO]

This is an initial implementation of instanceof CLASS checks like

a instanceof Array
a instanceof Map
a instanceof Set

Does static checks where possible, except in upcast cases like

class Parent<T> {}
class Child<T> extends Parent<T> {}

var a: Parent<i32> = new Child<i32>();
if (a instanceof Child) {
  ...
}

where an internal helper, here named Child~instanceof, is generated and called, that checks against all possible concrete instance ids. For example, if there's a Child<i32> and a Child<f32> present in the module, both are valid according to the dynamic check. Dynamic checks are potentially costly if there are lots of instances of a generic class.