stack effects + optimize exefn
array#fill -> array#new
check global decl names are not reserved
length -> len
use inline stack memory for vectors to reduce allocations
missing gcmark()
fix minor misc bugs
fix const folding
better error reporting
remove unused vecpop
SEL[*] gather operator
missing typestr for upval
removed unused TObject
pez_checksig() helper
cache closures with no upvalues
inline some things