instanceof AbstractClass.constructor should narrow to typeof AbstracClass

> Please try to reproduce the issue with `typescript@next`. It may have already been fixed. **TypeScript Version:** 3.3.0-dev.20181208 <!-- Search terms you tried before logging this (so others can find this issue more easily) --> **Search Terms:** static instanceof constructor **Code** ```ts type Meta = {foo: string}; abstract class Abstract { static meta: Meta; public abstract toString(): string; } const getMeta = (fromModule: any): Meta | undefined => { return fromModule instanceof Abstract.constructor ? fromModule.meta : undefined; }; ``` **Expected behavior:** Narrow the type of `fromModule` to `typeof Abstract`, so that static fields can be accessed. (In Typescript versions <= 3.1.6 the above code didn't raise an error, my guess is that the type was not narrowed at all) **Actual behavior:** The narrowed type of `fromModule` is `{}`: ``` Error:(10, 18) TS2339: Property 'meta' does not exist on type '{}'. ``` **Playground Link:** <!-- A link to a TypeScript Playground "Share" link which demonstrates this behavior --> https://www.typescriptlang.org/play/index.html#src=%0D%0Atype%20Meta%20%3D%20%7Bfoo%3A%20string%7D%3B%0D%0Aabstract%20class%20Abstract%20%7B%0D%0A%20%20static%20meta%3A%20Meta%3B%0D%0A%20%20public%20abstract%20toString()%3A%20string%3B%0D%0A%7D%0D%0A%0D%0Aconst%20getMeta%20%3D%20(fromModule%3A%20any)%3A%20Meta%20%7C%20undefined%20%3D%3E%20%7B%0D%0A%20%20return%20fromModule%20instanceof%20Abstract.constructor%0D%0A%20%20%20%20%3F%20fromModule.meta%20%3A%20undefined%3B%0D%0A%7D%3B%0D%0A **Related Issues:** <!-- Did you find other bugs that looked similar? --> I found the following potentially related issues but they didn't seem to be an exact match or to old (because this problem only exists since 3.2.1): - #27276 - #23274 - #16035 **Workaround** Creating a type guard is of course doable for a single abstract class. ``` const extendsAbstract = (FromModule: unknown): FromModule is typeof Abstract => FromModule && FromMod…