spinbarrier.hh: actually wait for all threads to reach barrier
spinbarrier.hh: actually wait for all threads to reach barrier

aclements/sv6,bowlofstew/sv6,aclements/sv6,bowlofstew/sv6,bowlofstew/sv6,aclements/sv6,aclements/sv6,bowlofstew/sv6,bowlofstew/sv6,aclements/sv6