[X86][SSE] Move ZeroVector creation into the shuffle pattern case where its actually used.

Also fix the ZeroVector's type - I've no idea how this hasn't caused problems........

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289336 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed