Update ExecUtils to support artd use cases. am: f0061f62fb am: 9d90db50c6 am: e1f623635d

Original change: https://android-review.googlesource.com/c/platform/art/+/2144965

Change-Id: Idb9292ce411aa3328e57aa03dfe728736d909f74
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>