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kotlinlang

Hi! I ran into some issues with how classes get translated into JS with Kotlin 1.4-M1. If I have the following Kotlin:
```open class Animal {
    open var name: String = "frank"
}

@JsExport
class Bear : Animal {
    constructor(): super()
}```
In the JS I would expect the following to work:
```const bear = new Bear()
bear.name === "frank"```
But `bear.name` is `undefined`. Looking at the JS output, the `Animal` class has the getters/setters but never defines the `name` property.

Not until I add `@JsExport` to the `Animal` class in Kotlin. The `name` property will now appear in the JS code but `bear.name` is still `undefined`.

It seems because the `Bear` class doesn’t call the `Animal` constructor so the underlying property `this._name` never gets initialized. I would expect the following to be in the JS output to match the `constructor(): super()` call:
```function Bear() {
    Animal.apply(this, Array.prototype.slice.call(arguments));
}```
Adding that to the JS output gives me my expected result: `const bear = new Bear(); bear.name === "frank"`