Revert "ART: Do not eagerly type LoopPhi [null, ...]"

Breaks some libcore tests. Revert to unblock others while investigating.

This reverts commit 3a738bfe9784b9ea0f2fccbe75f0c72ede536641.

Change-Id: I9f103c692199b8f9b6e7af469fc424512b57544a
3 files changed