[1, 2].sort({}) has unhelpful error message

[ljharb]

[1, 2].sort(true) and [1, 2].sort({}) throw a TypeError with the message "Array.prototype.sort: argument is not a JavaScript object".

This is unhelpful for true, and incorrect for {}. A better error message would perhaps be, `Array.prototype.sort: comparefn argument must be a function or undefined".

(discovered while looking into tc39/ecma262#785)