add constant specialization

borrow RunState instead

add counters

add a bunch more opcodes for lbbv

yeah ok its still messed up

really fix call/return for real this time

jump block in exec

scuffed exec effects

fix state threading, old ops

thread entire runstate through lbbv

just do the obvious but stupider thing instead

less bad thunk guard fast forwarding

suspend at the guard instead of emitting useless typechecks

more lbbv stuff

bundle up interpreter state in RunState object