fix(compiler): Generate stream restriction for scoped exprs [fixes LNG-222]

[InversionSpaces]

No description provided.

[linear]

LNG-222 Scope (`new`) generation for streams doesn't work with `try`

try makes compiler skip new for declared stream

func main():
        temp: *i8
        temp <<- 42

produces

(seq
 (call %init_peer_id% ("getDataSrv" "-relay-") [] -relay-)
 (xor
  (new $temp
   (ap 42 $temp)
  )
  (call %init_peer_id% ("errorHandlingSrv" "error") [%last_error% 0])
 )
)

while

func main():
    try:
        temp: *i8
        temp <<- 42

produces

(seq
 (call %init_peer_id% ("getDataSrv" "-relay-") [] -relay-)
 (xor
  (xor
   (ap 42 $temp)
   (null)
  )
  (call %init_peer_id% ("errorHandlingSrv" "error") [%last_error% 0])
 )
)