Add startup/post-startup bits for random profiles

Fixes warnings that were printed for the speed-profile tests.

Moved oat_writer debug check to be fatal to catch these errors in
the future.

Fixed some tests that caused the oat layout assert to fail.

Test: test/testrunner/testrunner.py -j8 --speed-profile --verbose --host
Test: test-art-host

Bug: 67029385
Change-Id: Iad804b3c81908ca1407f1f6069482f2ca2df70d1