Followup to the renaming in VEX r2735.
Also ignore AT_DCACHEBSIZE entries in the auxiliary vector as they
are not needed.
Fixes BZ 306587.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13481 a5019735-40e9-0310-863c-91ae7b9d1cf9