Fix/object allocation #20
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This PR changes the threshold for allocation Julia's large objects to follow immix's threshold. While this probably brings a benefit in terms of allocation (more objects can be allocated via fastpath), until
get_so_sizeis optimised, changing the threshold can actually degrade performance, since getting the objects size of large objects is way less expensive (loading a field from the header) than getting the size of small objects (check the object type, and calculate the size based on that). It should be merged with mmtk/julia#3.