analyzer: merge property info from constructors

[43081j]

Fixes #630.

---

This should handle merging of property information for situations like this:

class Foo {
  constructor() {
    /** @public some description */
    this.someProperty;
  }

  get someProperty() { return 1; }
}

we need to take the description from the constructor but everything else from the actual getter.

in terms of precedence, i take the property's info unless it is empty, then i try take the constructor's info.