Johannes Doerfert 02a4fcec6b [Attributor] Port AANonNull to the isImpliedByIR interface ...

AANonNull is now the first AA that is always queried via the new APIs
and not created manually. Others will follow shortly to avoid trivial
AAs whenever possible.

This commit introduced some helper logic that will make it simpler to
port the next one. It also untangles AADereferenceable and AANonNull
such that the former does not keep a handle on the latter. Finally,
we stop deducing `nonnull` for `undef`, which was incorrect.

2023-07-09 16:04:19 -07:00

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