[Webkit-unassigned] [Bug 234865] Add a helper function that returns the value of a std::optional<T> or constructs T if needed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234865

--- Comment #1 from Wenson Hsieh <wenson_hsieh at apple.com> ---
I found 116 instances in WebKit where we can replace this:

```
optional.value_or(InnerType { })
```

...with this:

```
valueOrDefault(optional)
```

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