This change will build the clang compilation images for version 10 and 11 in gem5's Google Cloud Build. These can then be used in the gem5 compilation tests. Change-Id: I9fc902bbaf3262c018231873abfe7fdedd13172c Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45682 Reviewed-by: Gabe Black <gabe.black@gmail.com> Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>