8152180: SIGFPE in CMSCollector::preclean with big CMSScheduleRemarkSamplingRatio
Summary: Rephrased the calculation routine to avoid an overflow for CMSScheduleRemarkSamplingRatio
Reviewed-by: jwilhelm, drwhite
8151939: VM_Version_init() print buffer is too small
Summary: Increase buffer size, use logging to print out version and os information
Reviewed-by: kvn, rprotacio, mockner