This allows single-stepping through REP/REPZ/REPNZ iterations. We mainly need this for a little more realistic timing model when, e.g., copying large memory areas with REP MOVSB. Be aware that memory-access tracing only works reliably for REPxx-prefixed instructions if Bochs was configured with --disable-repeat-speedups, as this Bochs optimization completely circumvents the usual memory access paths. git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1885 8c4709b5-6ec9-48aa-a5cd-a96041d1645a