gc_inline.h

[Andy Wingo]

It seems that the BDW GC, since version 7 or so, supports inline
allocation with thread-local freelists.  See gc_inline.h.  We can
probably improve our allocation speed significantly by using this
allocator in Guile.  It would require adding a freelist to scm_i_thread,
and passing the thread around wherever we would want inline allocation,
but that is already the case in the VM.

Could be a neat little project for someone -- mostly on master, where we
require BDW-GC 7.2.

Cheers,

Andy
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