[X86] Don't custom widen (v2i32 (setcc v2f32)) when...

[X86] Don't custom widen (v2i32 (setcc v2f32)) when -x86-experimental-vector-widening-legalization is in effect.

We aren't doing anything than what the generic legalizer will do so just let it do it.

llvm-svn: 341172