6848641: CMSCollector::_roots_scanning_options should be initialized
Summary: The field is now initialized in the constructor.
Reviewed-by: iveresov, jmasa, johnc
-export:JNI_GetDefaultJavaVMInitArgs
-export:JNI_CreateJavaVM
-export:JNI_GetCreatedJavaVMs
-export:jio_snprintf
-export:jio_printf
-export:jio_fprintf
-export:jio_vfprintf
-export:jio_vsnprintf