Do not classify Infinity and NaN

[jeanp413]

Fixes #42022

[jeanp413]

Not sure if there's a better way to check for Infinity and NaN, I copied this from checker.ts line 26202.
Let me know if there's a better way to fix this.

[DanielRosenwasser]

Sorry, I thought we'd have to expose something from the checker, but the logic is exactly the same as that of the type-checker. I think I'm going to need to back-pedal a bit and suggest to just check against Infinity and NaN, since exposing another API now seems overkill.

On that note, could you add these cases to the existing test?

// Regular properties

const obj1 = {
    Infinity: 100,
    NaN: 200,
    "-Infinity": 300
};

obj1.Infinity;
obj1.NaN;
obj1["-Infinity"];

// Shorthand properties

const obj2 = {
    Infinity,
    NaN,
}

obj2.Infinity;
obj2.NaN;

[orta]

Cool, improved the tests and made it only check for "Infinity" and not -Infinity (which didn't make a difference on the tests, so wasn't doing work anyway)