GetOwnProperty of TypedArray indexed fields is wrongly configurable

[Robin Morisset]

```
let a = new Uint8TypedArray(10);
let b = Object.getOwnPropertyDescriptor(a, 0);
assert(b.configurable === false);
```
should not fail: by section 9.4.5.1 (https://tc39.github.io/ecma262/#sec-integer-indexed-exotic-objects-getownproperty-p) that applies to integer indexed exotic objects, and section 22.2.7 (https://tc39.github.io/ecma262/#sec-properties-of-typedarray-instances) that says that typed arrays are integer indexed exotic objects.

[Robin Morisset]

Created attachment 317516 [details]
Patch

[Build Bot]

Attachment 317516 [details] did not pass style-queue:


ERROR: Source/JavaScriptCore/ChangeLog:7:  Line contains tab character.  [whitespace/tab] [5]
Total errors found: 1 in 4 files


If any of these errors are false positives, please file a bug against check-webkit-style.

[Robin Morisset]

Created attachment 317518 [details]
Patch without the tab character

[Saam Barati]

r=me

[WebKit Commit Bot]

Comment on attachment 317518 [details]
Patch without the tab character

Clearing flags on attachment: 317518

Committed r220377: <http://trac.webkit.org/changeset/220377>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.