In outer-loop VPlan, avoid emitting vector intrinsic calls for intrinsics
without a vector form. In VPRecipeBuilder, detect missing vector intrinsic
mapping and emit scalar handling instead of a vector call.
Also fix assertion when `llvm.pseudoprobe` in VPlan's native path is being
treated as a `WIDEN-INTRINSIC`.
Reproducer: https://godbolt.org/z/GsPYobvYs