Post-patch to r2668. Choose more sensible names. Purely mechanical, no
functional changes.
Mttt -> Ittt
Mtct -> Ittc
Mttc -> Itct
MTcc -> Itcc
eX -> e1  and conX -> con1


git-svn-id: svn://svn.valgrind.org/vex/trunk@2672 8f6e269a-dfd6-0310-a8e1-e2731360e62c