Change dirty-image-objects file format.

Use actual descriptors instead of "pretty decriptors"
to avoid conversion during boot image compilation.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: boots
Test: Boot images before and after are identical.
Bug: 175869411
Change-Id: Iab12cc1444045fb297c2e062ff07bb1feb5dd781
2 files changed