Revert "Stop using the runtime classpath in dex2oat"

This reverts commit 84f82b9972ec29bd05b1575ae6d638255be2f285.

Reason for revert: I submitted this to ealrly. It needs to be submitted after https://android-review.googlesource.com/c/450390 gets merged

Change-Id: I91e6259b61d72a48a1d18e62f53ef82f18692930
3 files changed