More IMCC bugs

[Dan Sugalski]

A .sub that's prototyped (Dunno about the non-prototyped case) that 
doesn't have a .pcc_begin_return/.pcc_end_return pair in it (empty is 
fine) will cause parrot to crash'n'burn. Subs without a designated 
return should be assumed to return nothing, the same as if an empty 
begin/end pair was specified.
--
                                        Dan

--------------------------------------"it's like this"-------------------
Dan Sugalski                          even samurai
[EMAIL PROTECTED]                         have teddy bears and even
                                      teddy bears get drunk