Currently, in SLP if we support transformation from (Bool + CmpU + CMove) to (VectorMaskCmp + VectorBlend), the unsigned comparison information is lost, it's in CmpU, but current code only check Bool for the information. For details please check code at `SuperWordVTransformBuilder::make_vector_vtnode_for_pack` and `PackSet::get_bool_test`.

This loss of unsigned comparison information blocks the optimization proposed in https://github.com/openjdk/jdk/pull/25336 and https://github.com/openjdk/jdk/pull/25341.