util-docker,tests: Add Clang-14 compiler image and test

This increases gem5's supported compiler up to Clang Version 14.

Change-Id: Ia85e81f33367b7186dd54fc2aeb3541111ccdb57
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/64176
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed