set Thread::exception to null before creating ExceptionInInitializerError
set Thread::exception to null before creating ExceptionInInitializerError

If we don't do this, the VM will crash when it tries to create a stack
trace for the error because makeObjectArray will return null
immediately when it sees there is a pending exception.

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