ART benchmarks: use 18.04 image

The bash version in 16.04 is no longer supported by the main script.

Change-Id: I56e49f3f81368b822809ac7456594e3e87afa73f
6 files changed
tree: f93a8f4929341fc144f0335281ec4215b7341523
  1. android/
  2. pm-qa/
  3. ubuntu/
  4. .gitreview
  5. merge-fragments.py
  6. README