There are many cases where we specify additional arguments that only apply to run-webkit-tests, but the existing additionalArguments property applies to many different steps. We should create a dedicated property to use for arguments specific to run-webkit-tests.
<rdar://problem/107852821>
Pull request: https://github.com/WebKit/WebKit/pull/12588
This is no longer needed (at least not in my proposed form) after https://commits.webkit.org/263387@main