[parrot/parrot] af8b19: convert tests from PASM to PIR

[GitHub]

  Branch: refs/heads/coke/rm_pasm
  Home:   https://github.com/parrot/parrot
  Commit: af8b198d8a91c567c38f382042b0b2e6ac970347
      https://github.com/parrot/parrot/commit/af8b198d8a91c567c38f382042b0b2e6ac970347
  Author: Will "Coke" Coleda <will at coleda.com>
  Date:   2012-04-29 (Sun, 29 Apr 2012)

  Changed paths:
    M t/op/stringu.t

  Log Message:
  -----------
  convert tests from PASM to PIR

Remove unneeded opcodes in the process.