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[wip] keep working on treadmill allocator

make tracing able to trace freelist space (may have degraded
performance, gonna need to tune gc performance later)
13 jobs from master in 25 minutes and 30 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #1756
test:cargo:api

01:52

passed #1758
test:cargo:compiler

02:11

passed #1757
test:cargo:ir

01:50

failed #1759
test:cargo:runtime

02:43

passed #1761
testjit:binops

01:52

passed #1762
testjit:cmpops

01:52

failed #1763
testjit:controlflow

01:31

passed #1764
testjit:convops

01:49

failed #1765
testjit:double

01:34

failed #1766
testjit:memops

01:33

passed #1760
testjit:milestones

01:51

passed #1767
testjit:otherops

01:50

passed #1768
testjit:rpython

02:55