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

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

Change-Id: Ia24a087aa6355d121164ff07aed66311d52a8dfb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>