[X86] Require second operand of X86vshiftuniform to be an integer. NFC

We don't need to require the first operand to be an integer because we already said it was the same type as the result which we also constrained to an integer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350455 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed