dillon1000/react

Add new effect fields to old fork, and vice versa (#20246)

* Add new effect fields to old fork

So that when comparing relative performance, we don't penalize the new
fork for using more memory.

* Add firstEffect, et al fields to new fork

We need to bisect the changes to the recent commit phase refactor. To
do this, we'll need to add back the effect list temporarily.

This only adds them to the Fiber type so that the memory is the same
as the old fork.