The PSHUFB mask decode routine used to assert if the mask index was out of
range (<0 or greater than the size of the vector). The problem is, we can
legitimately have a PSHUFB with a large index using intrinsics. The
instruction only uses the least significant 4 bits. This change removes the
assert and masks the index to match the instruction behaviour.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218242 91177308-0d34-0410-b5e6-96231b3b80d8
