grammatical fix
publish pic_callcc
s/print_irep/pic_dump_irep/g
add PIC_TT_IREP
irep object is now controlled under GC
pic->irep is a root marker
ireps generated by top codegen are not registered to pic->irep. get them
marked manually.
some global stacks are missed to free
Merge branch 'master' into irep-gc
do not free objects in pic->irep by hands
cosmetic changes
store constructing iseq in scope object, not pic_irep
duplicate variable binding
ccapa property no longer used
shrink code size
store irep objects inside parent irep object