Implementation of a Bimodal Insertion Policy replacement policy. Change-Id: Ife058d0d4310dbcb35858348006189f0b2bf7c37 Reviewed-on: https://gem5-review.googlesource.com/9003 Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com> Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>