[netlabs #636] GC Bench: out-of-pool-memory logic

# New Ticket Created by Mike Lambert # Please include the string: [netlabs #636] # in the subject line of all future correspondence about this issue. # URL: http://bugs6.perl.org/rt2/Ticket/Display.html?id=636 Peter's latest patch also included changes to the logic in terms of what to do

Re: [netlabs #636] GC Bench: out-of-pool-memory logic

Results are: before after gc_alloc_new.pbc 4.1559990.18 gc_alloc_new seems to have improved a *lot*. This is because gc_alloc_new allocates a lot of memory using the same headers. It doesn't tear through headers quickly enough to