Generated IPC serializers for base classes run conditions for all the derived classes Once the derived class has been found, other the type cannot be other derived class
<rdar://problem/111436035>
Pull request: https://github.com/WebKit/WebKit/pull/15361
Committed 265711@main (f0d6209f8752): <https://commits.webkit.org/265711@main> Reviewed commits have been landed. Closing PR #15361 and removing active labels.