mem-cache: Add multiple eviction stats

Add stats to inform how many blocks were evicted due to a sector
replacement/eviction.

Change-Id: I886365506016d0888f835d182b3b65a808a9dccd
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22606
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
3 files changed