Re-enabling optimization in mrt100* accidentally disabled by Andrew's change set #1650991 on 3/15/2017.
Re-enabling optimization in mrt100* accidentally disabled by Andrew's change set #1650991 on 3/15/2017.

[tfs-changeset: 1657118]

shrah/corert,gregkalapos/corert,tijoytom/corert,gregkalapos/corert,krytarowski/corert,yizhang82/corert,tijoytom/corert,gregkalapos/corert,krytarowski/corert,shrah/corert,shrah/corert,krytarowski/corert,yizhang82/corert,krytarowski/corert,yizhang82/corert,shrah/corert,gregkalapos/corert,tijoytom/corert,tijoytom/corert,yizhang82/corert