Enable profiled guided compilation in dex2oat

- add parsing of the profile info saved during JIT.
- don't compile methods which are not part of the profile info.
- delete old profile hooks.
- add test for reading/writing profile. The test is disable in:
   * interpreter modes: the test needs JIT.
   * no-dex2oat/no-prebuild: we only save profiling info for the primary
     oat file. In these modes we don't create oat files and thus nothing
     is saved.

Bug:26080105

Change-Id: Ifdc63dc9d4b537fc79e54c3edc3ae3a462bc30fb