VEX, ppc code cleanup

This patch removes some dead code left behind when the code was restructured
to fix the implementation changes to make it compliant with the iop
definitions.

The patch makes no functional changes as it is just removing code that is not
reachable.

This patch is for Bugzilla 314269.

Signed-off-by: Carl Love <cel@us.ibm.com>


git-svn-id: svn://svn.valgrind.org/vex/trunk@2697 8f6e269a-dfd6-0310-a8e1-e2731360e62c