[M3commit] [modula3/cm3] 10fab6: remove unnecessary typedef

[Jay Krell]

  Branch: refs/heads/master
  Home:   https://github.com/modula3/cm3
  Commit: 10fab6f00835fd04d6ba9766ed789a87d9ad8490
      https://github.com/modula3/cm3/commit/10fab6f00835fd04d6ba9766ed789a87d9ad8490
  Author: Jay Krell <jay.krell at cornell.edu>
  Date:   2015-06-13 (Sat, 13 Jun 2015)

  Changed paths:
    M m3-sys/m3back/src/M3C.m3

  Log Message:
  -----------
  remove unnecessary typedef
allow signed right shift -- which is cast to unsigned, shift, cast back