Disable assert in O3 fetch.
Disable assert in O3 fetch.

This triggers sometimes for some reason, but apart from that,
everything seems to work fine.

TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu,TUD-OS/gem5-dtu