Tests that Runtime.evaluate's REPL mode correctly interacts with the compliation cache (crbug.com/1108021)
Prefill the cache with non-REPL mode script
{
    id : <messageId>
    result : {
        result : {
            description : 8
            type : number
            value : 8
        }
    }
}
REPL mode scripts always return a Promise.
The first script only returns "8" instead. When the inspector doesn't find a promise (due to a cache hit), it would respond with "undefined".
{
    id : <messageId>
    result : {
        result : {
            description : 8
            type : number
            value : 8
        }
    }
}