Revert "Revert "Thumb2: Reduce memory used for fixup dependencies.""

Fix: Correctly ignore dependencies of the non-expandable
fixups rather than non-expandable dependents of any fixups.

Bug: 28343425
Bug: 28256882

This reverts commit d89e2418f2c6d9897fee219f8df9c20ca93c80db.

Change-Id: I7161fbfd094ce1ddc097826b53c894a7377a2b9d
3 files changed