Revert^4 Build only the needed run-test shards with "test.py -b -t XXX" am: a6f7c74b50

Original change: https://android-review.googlesource.com/c/platform/art/+/2223918

Change-Id: I544d7813650d02265b8a034a88c187b6e6ff4801
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>