x86_64: removed commented out unused code in pmap_target.
x86_64: removed commented out unused code in pmap_target.

utsav2601/cmpe295A,linusyang/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,kishoredbn/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,kishoredbn/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,8l/barrelfish,mslovy/barrelfish,kishoredbn/barrelfish,mslovy/barrelfish,linusyang/barrelfish,8l/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,8l/barrelfish,linusyang/barrelfish,BarrelfishOS/barrelfish,mslovy/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,mslovy/barrelfish,utsav2601/cmpe295A,8l/barrelfish,BarrelfishOS/barrelfish,linusyang/barrelfish,8l/barrelfish,linusyang/barrelfish,utsav2601/cmpe295A,8l/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,utsav2601/cmpe295A