protect local variables in red-black tree implementation from GC
protect local variables in red-black tree implementation from GC

MaartenR/avian,badlogic/avian,lostdj/avian,badlogic/avian,minor-jason/avian,bgould/avian,minor-jason/avian,marcinolawski/avian,joshuawarner32/avian,bigfatbrowncat/avian-pack.avian,lwahlmeier/avian,dicej/avian,dicej/avian,lwahlmeier/avian,bgould/avian,getlantern/avian,MaartenR/avian,badlogic/avian,getlantern/avian,lostdj/avian,marcinolawski/avian,bigfatbrowncat/avian-pack.avian,ucdseniordesign/avian,ucdseniordesign/avian,ucdseniordesign/avian,MaartenR/avian,marcinolawski/avian,minor-jason/avian,MaartenR/avian,lwahlmeier/avian,lostdj/avian,bigfatbrowncat/avian-pack.avian,joshuawarner32/avian,joshuawarner32/avian,getlantern/avian,joshuawarner32/avian,marcinolawski/avian,bgould/avian,badlogic/avian,dicej/avian,ucdseniordesign/avian,bgould/avian,dicej/avian,minor-jason/avian,getlantern/avian,bigfatbrowncat/avian-pack.avian,lwahlmeier/avian,lostdj/avian