Get rid of the old bt/bts/btr/btc implementation.

Turns out these insns are also available as Grp8 extensions, with
literal bit-offset values.  Nuisance.  I've #if 0'd out the old code
which implements them since am too lazy to fix them properly, and I
can't find any cases of their use anyway.  I'll wait until someone
yelps.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@75 a5019735-40e9-0310-863c-91ae7b9d1cf9
8 files changed