Drop REASON_FORCED_DEXOPT.

This can already be configured with the default compiler filter.

Also remove unused performDexOptIfNeeded.

bug:35794392
Test: device boots, forced dexopt works.
Change-Id: I14fc86c4783b2d7ac9cf8972b6619ba303e79659
(cherry picked from commit e103256c1fee6b53ead10efe13ca35ad270626fa)
3 files changed