fix reads of out-of-bounds values in tokenizer.h
fix reads of out-of-bounds values in tokenizer.h

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