Add vassert for DFP shift value to make sure shift value is an immediate value.
V-bit tester was putting shift value in a register for the DFP shift
instructions causing the test to crash, see bugzilla #305948.  

git-svn-id: svn://svn.valgrind.org/vex/trunk@2512 8f6e269a-dfd6-0310-a8e1-e2731360e62c
1 file changed