[parrot/parrot] 1da6c6: frontend: fix -R trace

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/parrot/parrot
  Commit: 1da6c62f7f8471a674ef4ce8eec1e6f275bd0ea3
      https://github.com/parrot/parrot/commit/1da6c62f7f8471a674ef4ce8eec1e6f275bd0ea3
  Author: Reini Urban <rurban at cpanel.net>
  Date:   2014-03-08 (Sat, 08 Mar 2014)

  Changed paths:
    M src/embed/api.c
    M src/ops/set.ops

  Log Message:
  -----------
  frontend: fix -R trace

trace is a seperate runcore, but misses a _init registration
function, we rather go through the slow runcore and check
then the trace flag.
Fixes the t/run/options.t breakage of the previous commit