Fix rfi instruction: do not depend on current execution mode but on the execution mode that will be effective after the return. Add rfci, rfdi and rfmci for BookE PowerPC. Extend mfdcr / mtdcr and implement mfdrcx / mtdcrx. git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2544 c046a42c-6fe2-441c-8c8c-71466251a162