Detect exotic assignment patterns to JS prototypes

Template added by by @mjbvz

TS Versions: 3.7-20190911

Repo
For the JS:

function A() {}

A.prototype.foo = 1;

[A.prototype.bar] = [2],
{baz: A.prototype.baz} = {baz: 3};

const proto = A.prototype;
proto.prop = 4;

Expected
Intellisense for instances of A should show four properties

Actual
Only foo shown.

Original report below

Intellisense seems to only recognize straightforward prototype property definitions like Class.prototype.prop = value.

Assigning Class.prototype to a variable and extending that, or using destructuring syntax will not be recognized by it:

Start by reproducing the JavaScript snippet in TypeScript IntelliSense and confirm that only foo appears on A instances. No implementation file or test is named, so trace the language-service/type-checker handling of prototype assignments, aliases, and destructuring. Done means all four properties appear in IntelliSense.