ART: Implement DeadPhiHandling in PrimitiveTypePropagation

DeadPhiHandling revives non-conflicting phis with environment uses
but does not properly merge types. To not duplicate code, this patch
modifies PrimitiveTypePropagation to deal with conflicts and thus
replaces DeadPhiHandling altogether.

Bug: 24252151
Bug: 24252100

Change-Id: I198c71d1b8167fc05783a5a24aa9f1e3804acafe
12 files changed