Devin Rousso

[JSC] add support for `Iterator.concat`

4

#### 25e50e8011ba298f3bf0e33dbf65d3b529ad650a [JSC] add support for `Iterator.concat` https://bugs.webkit.org/show_bug.cgi?id=281109 Reviewed by NOBODY (OOPS!). This will allow for easier composition of iterators instead of having to manually create a generator or spread...