standardize hcid
add getHCID, make Global a HC
add user hooks
make sure ThrowStatement pops value
add SharedFunctionInfo accessor
fix valuestack events
fix cfg events
fix bad require
fix signature bug
only unreachable if no other incoming edges
if there is no prototype, do not assign one
add missing _builtins
fix graphviz
add errorfunction, fix call-stack
fix new-ing functions
fix some issues
fix ValueStack#toObject
fix Array hidden class advancement
only accept return values from return statements with arguments
add marking