Nadine Salter a30c087616 Clean up ASDisplayNode internal flags.
* Reorganise and rename `_flags` for clarity and consistency.
* Remove ambiguity between `implementsDisplay` and `hasClassDisplay`.
* Delete useless `hasWillDisplayAsyncLayer` check -- make it a simple
  subclass override point, as with `didDisplayAsyncLayer:`.
* Minor comment cleanup.
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