Revert "Revert^2 "Partial Load Store Elimination""

This reverts commit fc1ce4e8be0d977e3d41699f5ec746d68f63c024.

Bug: 67037140

Reason for revert: Fails read-barrier-table-lookup tests.

Change-Id: I373867c728789bc14a4370b93a045481167d5f76
29 files changed