Assertion error: bad type object in conversion ToInteger

ChakraCore version:
commit c3ead3f

Build cmd:
```shell
./build.sh --debug --static
```

Test case:
```js
function test(){
async function foo(a1,a2) {

for (let i = a2; i < a1; i = i ** foo) {
const x = await i;
}

function bar () {
}

const u = new Uint8Array(bar);
const p = new Proxy(u,Reflect);
const o = Object.seal(p);
}

const r = foo();
return r;
}

for(let i=0; i<1024; i++){
test();
}

```

Execute
```shell
./ch ./test.js
```

Error msg:
```
ASSERTION 2791936: (ChakraCore/lib/Runtime/Language/JavascriptConversion.cpp, line 938) bad type object in conversion ToInteger
Failure: (JavascriptOperators::IsObject(aValue))
Illegal instruction
```