Changes to track r2664, which changed the type of the condition field
of Mux0X from Ity_I8 to Ity_I1.  Patch from Florian Krohm.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13267 a5019735-40e9-0310-863c-91ae7b9d1cf9