Revert "Change LFENCE such that it is ignored by younger loads if all"
Revert "Change LFENCE such that it is ignored by younger loads if all"

This reverts commit 64f679a337becb803f7b7e30574a2c658740fd64.

This doesn't help and is potentially incorrect (on a TLB miss).

Change-Id: I5eff261f8429ddeedfaafe907b3b49fadb257507

s-kanev/XIOSim,s-kanev/XIOSim,s-kanev/XIOSim,s-kanev/XIOSim