Bug 309048 – URLPattern.exec() crashes with nested capturing group

• Status: RESOLVED
• Resolution: FIXED
• Component: DOM

[Chris Dumez]

URLPattern.exec() crashes with nested capturing group:
```
new URLPattern({ pathname: "/:foo((?<x>a))" }).exec({ pathname: "/a" });
```

[Chris Dumez]

<rdar://171543463>

[Chris Dumez]

Pull request: https://github.com/WebKit/WebKit/pull/59781

[EWS]

Committed 308534@main (e3f20183b0c4): <https://commits.webkit.org/308534@main>

Reviewed commits have been landed. Closing PR #59781 and removing active labels.