Update ExecUtils to support artd use cases. am: f0061f62fb

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

Change-Id: Idadd99e1d362d5eab2d1d9f855ffe8e87ad30cd5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>