Issues indexing with unique symbols on generic types

[DanielRosenwasser]

Found helping @bterlson with something.

Basically, the main issue is that as soon as I use an indexed access type with a unique symbol on a type parameter, things fall apart.

declare const fooProp: unique symbol;

export interface Foo<T> {
  [fooProp]: T
}

function f<T extends Foo<any>>(x: T) {
    const abc = x[fooProp] // expected: 'T[typeof fooProp]'; actual: 'any'

    /**
     * Expected: no error
     * Actual: Type 'unique symbol' cannot be used to index type 'T'.
     */
    const def: T[typeof fooProp] = x[fooProp]
}

[yortus]

The second problem looks the same as #21912.