TimeClip's incorrect ToInteger

[Leo Balter]

From the test262 runner (https://build.webkit.org/builders/Apple%20Sierra%20Release%20Test262%20%28Tests%29/builds/2187/steps/test262-test/logs/stdio)

- test/intl402/DateTimeFormat/prototype/format/time-clip-to-integer.js
- test/intl402/DateTimeFormat/prototype/formatToParts/time-clip-to-integer.js

Intl.DateTimeFormat#format calls are not properly extracting the ToInteger value from its first argument.

```
var dtf = new Intl.DateTimeFormat(undefined, {
    hour: "numeric", minute: "numeric", second: "numeric"
});


dtf.format(-0.9) // expects dtf.format(0)
```

Currently returning the same as `dtf.format(-1)`

---

Also affects Intl.DateTimeFormat#formatToParts:


```
var dtf = new Intl.DateTimeFormat(undefined, {
    hour: "numeric", minute: "numeric", second: "numeric"
});

function formatAsString(dtf, time) {
    return dtf.formatToParts(time).map(part => part.value).join("");
}


formatAsString(dtf, -0.9) // expects formatAsString(dtf, 0)
```

Currently returning the same as `formatAsString(dtf, -1)`

[Leo Balter]

Sounds like this is fixed by the Bug 185578 / https://trac.webkit.org/changeset/231740

[Radar WebKit Bug Importer]

<rdar://problem/40217650>