[VP] Correct lowering of predicated fma and faddmul to avoid strictfp. (#85272)

Correct missing cases in a switch that result in @llvm.vp.fma.v4f32
getting lowered to a constrained fma intrinsic. Vector predicated
lowering to contrained intrinsics is not supported currently, and
there's no consensus on the path forward. We certainly shouldn't be
introducing constrained intrinsics into a function that isn't strictfp.

Problem found with D146845.