Do not modify FLAG_parallel_recompilation after start up.

R=jkummerow@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/17202006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15195 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/assert-opt-and-deopt.js

@@ -25,8 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax
-%SetFlags("--noparallel-recompilation");
+// Flags: --allow-natives-syntax --noparallel-recompilation
 
 /**
  * This class shows how to use %GetOptimizationCount() and