Add vm_safe_mode to dexopt.

The flag enforces interpret-only flag for dex2oat.

Bug: 12457423

(cherry picked from commit b1efac103523efccbe671e76cc0eaaeab810415b)
(cherry picked from commit 97477d203eaf0c3235bbe2415356f20a0431cada)

Change-Id: I215339527e998b24e274c8df42a5024839e6a9fa
3 files changed