Object literals computed property names allow literal-typed expressions

[sandersn]

This is a late-stage name replacement in checkObjectLiteral, so it's a special-case of Ron's upcoming dynamic names change.

Fixes #16687

[mthurlin]

With this change, will the following be supported?

function makeFooOrBar(key: "foo" | "bar"): {foo: number} | {bar: number} {
    return {[key]: 4711}; // Currently an error, as "key" is widened to string
}

[mhegazy]

@mthurlin that is tracked by #13948