Code generation - cleanup
Code generation - cleanup

* rename the historical 's0' to meth (there is no S0 method name
  register anymore)
* simplify code a bit


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@11412 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot