am a20a9929: Move LIKELY and UNLIKELY to a public header file.

Merge commit 'a20a99298b45b4b6c7c9c528066a3e055e601535' into dalvik-dev

* commit 'a20a99298b45b4b6c7c9c528066a3e055e601535':
  Move LIKELY and UNLIKELY to a public header file.