Finish collection cycle for non concurrent gc
Finish collection cycle for non concurrent gc

This would mean we wouldn't do the sweeping and mark rotation, causing
bugs like mentioned in #2995 where we would crash with the
non-concurrent GC.

heftig/rubinius,heftig/rubinius,benlovell/rubinius,ruipserra/rubinius,sferik/rubinius,Wirachmat/rubinius,ruipserra/rubinius,ngpestelos/rubinius,heftig/rubinius,heftig/rubinius,mlarraz/rubinius,Wirachmat/rubinius,kachick/rubinius,benlovell/rubinius,jsyeo/rubinius,Wirachmat/rubinius,kachick/rubinius,Wirachmat/rubinius,jemc/rubinius,dblock/rubinius,jemc/rubinius,Wirachmat/rubinius,benlovell/rubinius,digitalextremist/rubinius,dblock/rubinius,mlarraz/rubinius,benlovell/rubinius,ngpestelos/rubinius,mlarraz/rubinius,ruipserra/rubinius,kachick/rubinius,digitalextremist/rubinius,jsyeo/rubinius,ngpestelos/rubinius,benlovell/rubinius,digitalextremist/rubinius,jemc/rubinius,benlovell/rubinius,mlarraz/rubinius,dblock/rubinius,heftig/rubinius,mlarraz/rubinius,sferik/rubinius,sferik/rubinius,heftig/rubinius,jsyeo/rubinius,digitalextremist/rubinius,dblock/rubinius,Azizou/rubinius,jemc/rubinius,mlarraz/rubinius,ngpestelos/rubinius,kachick/rubinius,Wirachmat/rubinius,ngpestelos/rubinius,Azizou/rubinius,mlarraz/rubinius,sferik/rubinius,ngpestelos/rubinius,dblock/rubinius,ruipserra/rubinius,jemc/rubinius,kachick/rubinius,jsyeo/rubinius,Azizou/rubinius,jemc/rubinius,heftig/rubinius,Wirachmat/rubinius,kachick/rubinius,ruipserra/rubinius,Azizou/rubinius,digitalextremist/rubinius,digitalextremist/rubinius,sferik/rubinius,benlovell/rubinius,jsyeo/rubinius,kachick/rubinius,jsyeo/rubinius,Azizou/rubinius,ruipserra/rubinius,sferik/rubinius,ruipserra/rubinius,dblock/rubinius,jemc/rubinius,Azizou/rubinius,digitalextremist/rubinius,Azizou/rubinius,ngpestelos/rubinius,jsyeo/rubinius,dblock/rubinius,kachick/rubinius,sferik/rubinius