[x86] don't try to create a vector integer inst for an SSE1 target (PR30512)

This bug was introduced with:
http://reviews.llvm.org/rL272511

We need to restrict the lowering to v4f32 comparisons because that's all SSE1 can handle.

This should fix:
https://llvm.org/bugs/show_bug.cgi?id=28044

llvm-svn: 282336