This commit is for Bugzilla 334834.  The Bugzilla contains patch 2 of 3
to add PPC64 LE support.  The other two patches can be found in Bugzillas
334384 and 334836.

POWER PC, add the functional Little Endian support, patch 2 VEX part

The IBM POWER processor now supports both Big Endian and Little Endian.
The ABI for Little Endian also changes.  Specifically, the function
descriptor is not used, the stack size changed, accessing the TOC
changed.  Functions now have a local and a global entry point.  Register
r2 contains the TOC for local calls and register r12 contains the TOC
for global calls.  This patch makes the functional changes to the
Valgrind tool.  The patch makes the changes needed for the
none/tests/ppc32 and none/tests/ppc64 Makefile.am.  A number of the
ppc specific tests have Endian dependencies that are not fixed in
this patch.  They are fixed in the next patch.

Per Julian's comments renamed coregrind/m_dispatch/dispatch-ppc64-linux.S
to coregrind/m_dispatch/dispatch-ppc64be-linux.S  Created new file for LE
coregrind/m_dispatch/dispatch-ppc64le-linux.S.  The same was done for
coregrind/m_syswrap/syscall-ppc-linux.S.

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

git-svn-id: svn://svn.valgrind.org/vex/trunk@2914 8f6e269a-dfd6-0310-a8e1-e2731360e62c