ART: Emit debug info when app is debuggable

Emit debug symbols and CFI when dex2oat is compiling with the
--debuggable flag.

Bug: 17011129

(cherry picked from commit 8484d23186c229e2927441f85ae819abb4996072)

Change-Id: I0afab1e46abd819eded2b823580e766619497393