Power PC Add support for ISA 3.0, part 3

Power PC Add support for ISA 3.0, part 3

Added support to emulate lxsd, lxssp, lxv, stxsd, stxssp, and stxv
xscpsgnqp, xscmpoqp, xscmpuqp, xscmpexpqp, xststdcqp, xsabsqp,
xsxexpqp, xsnabsqp, xsnegqp, xsxsigqp, xsiexpqp, xsxexpdp, xsxsigdp,
xscmpexpdp, xststdcdp, xsiexpdp, xsxtdcsp, xvxexpdp, xvxexpsp,
xvxsigdp, xvxsigsp, xviexpsp, xviexpdp, xvtstdcsp, xvtstdcdp
instructions.

valgrind bugzilla 362329

git-svn-id: svn://svn.valgrind.org/vex/trunk@3220