The Learning gem5 part 3 tests require the building of the X86_MSI binary. These are the only tests that require this protocol. Building this is not worth it to just run these tests. They've therefore been moved to be run nightly rather than as a pre-submit/kokoro test. Change-Id: If0cdd9c30a160a01cef5fcda8a5433ab2d6ac882 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50027 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>