Incorrect prototype handling

[SeeSpring]

let a = {a:0}
let b = {get a(){return 0}}
let c = Math.random() ? a : b
let d = {}
Object.setPrototypeOf(d, c)
let e = ''
if ('a' in d) {
  e = 0
}
e.toUpperCase()

Throws Uncaught TypeError: e.toUpperCase is not a function at runtime

[kaleidawave]

Yes there seems to be some issues with https://kaleidawave.github.io/ezno/playground/?id=klnuy

1. has_property could do better on unions or condition results (in the case of the value assigned to c). The currently do not look at both sides and figure a result. (the first print_type("a" in c); should be true)
2. It seems that the setPrototypeOf does not register the prototype when the prototype is a conditional type. It works for setPrototypeOf(d, a) and setPrototypeOf(d, b) but not with c. Once the property access works and returns a result, then "a" in d should return true (rather than false and the example above should work 🤞)

[kaleidawave]

Have investigated this just now and I think I have found two problems

1. setPrototypeOf is an internal function. Most internal functions shouldn't run if there argument are not constants although some should. Have added it to the list that run if argument is generic (like conditional types are)
2. The access on the prototype looks up "simple object properties", rather than running the general try get property on type. Should change which function is called.

Should have a fix in #209 for it later (should do in separate commit)