This increases gem5's supported compiler up to GCC Version 12 Change-Id: Ifed5b8456bd1ab36a2fa58d8be7911acbef29bdd Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/64174 Reviewed-by: Kunal Pai <kunpai@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com> Maintainer: Bobby Bruce <bbruce@ucdavis.edu>