This small change is meant to enable gem5.fast compilation for riscv. Also, the riscv tests based on gem5.fast work now and are removed from .testignore. Change-Id: Id9c96d8e4682a74ec1d77a66eae53d6f9b64d302 Issue-On: https://gem5.atlassian.net/browse/GEM5-526 Issue-On: https://gem5.atlassian.net/browse/GEM5-527 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/28893 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>