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Warn when doing createRoot twice on the same node (another approach) (#17329)

* Unify fields used for createRoot warning and event system

* Warn when doing createRoot twice on the same node

* Stricter check for modern roots

* Unmark asynchronously

* Fix Flow
D
Dan Abramov committed
a7b4d51a20a00f0f60b113c3a02326ccf69aef82
Parent: be3bfa6
Committed by GitHub <noreply@github.com> on 11/10/2019, 12:54:13 AM