Power PPC 128bit modulo and carry instruction fix

Power PPC 128bit modulo and carry instruction fix

VEX commit 3209 fixed: an issue with caculating the carry to the next 32-bit
chunk for the Power PPC 128-bit add and subract instructions: vaddcuq, vadduqm,
vsubcuq, vsubuqm, vaddecuq, vaddeuqm, vsubecuq, vsubeuqm

The corresponding test case didn't catch the issue.  This commit adds data
values to the test that verify the issue is fixed.

Valgrind Bugzilla 359472

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15790