tree a960c3502c0eaf33d29544a40c57aee79c4942e0
parent a0856f5158e35e8cd83b36ece16c58915292653a
author Mathieu Chartier <mathieuc@google.com> 1439761024 -0700
committer Mathieu Chartier <mathieuc@google.com> 1439858351 -0700

Fix and improve reference cache mod-union table

Improvements:
Remove cards that only contain null references, this can save memory
in some cases.

Fixes:
Fix a bug where the mod-union table didn't properly handle class
loaders in the boot image. This was cause by not adding the new
classes as references. The fix is to leave these cards dirty.

Bug: 23203999
Change-Id: Ib1f1f74154df976dd8abaf2430c6dabd4cae2dbe