Bug 330319 - vex amd64->IR: unhandled instruction bytes: 0xF 0x1 0xD5 (xend)

We are never in an transaction (xbegin immediately aborts).
So this just always generates a General Protection Fault.

git-svn-id: svn://svn.valgrind.org/vex/trunk@2931 8f6e269a-dfd6-0310-a8e1-e2731360e62c