increased the morecore heap size to 3.5GB
increased the morecore heap size to 3.5GB

large graph computations required a bigger heap size. 

BUG: the way it is right now, a heapsize larger ghan 3.5G is not
possible as the thread structs will be placed above the 32bits which
will not fit into the LDT.
kishoredbn/barrelfish,utsav2601/cmpe295A,kishoredbn/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,linusyang/barrelfish,linusyang/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,mslovy/barrelfish,kishoredbn/barrelfish,linusyang/barrelfish,mslovy/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,8l/barrelfish,kishoredbn/barrelfish,kishoredbn/barrelfish,linusyang/barrelfish,mslovy/barrelfish,8l/barrelfish,utsav2601/cmpe295A,8l/barrelfish,8l/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,linusyang/barrelfish,BarrelfishOS/barrelfish,8l/barrelfish,mslovy/barrelfish,utsav2601/cmpe295A,8l/barrelfish,utsav2601/cmpe295A,BarrelfishOS/barrelfish