[Webkit-unassigned] [Bug 272274] New: RegExp.prototype[Symbol.matchAll] doesn't respect `v` flag

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=272274

            Bug ID: 272274
           Summary: RegExp.prototype[Symbol.matchAll] doesn't respect `v`
                    flag
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aosukeke at gmail.com

poc:

```js
function doMatchAll(regex) {
    const text = '��a��';
    const matches = [...RegExp.prototype[Symbol.matchAll].call(regex, text)];
    print(matches.map(match => match.index));
}

doMatchAll(/(?:)/g);
// expected: 0,1,2,3,4,5
// actual  : 0,1,2,3,4,5

doMatchAll(/(?:)/gu); // 0,2,3,5
// expected: 0,2,3,5
// actual  : 0,2,3,5

doMatchAll(/(?:)/gv); // 0,1,2,3,4,5
// expected: 0,2,3,5
// actual  : 0,1,2,3,4,5
```

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