[LV] Add tests where uniform recipe gets predicated for scalable VFs.
Currently the tests crash, due to a VPReplicateRecipe getting predicated
for scalable vectors.
Precommits tests for https://github.com/llvm/llvm-project/pull/98892.
Test cases for
* https://github.com/llvm/llvm-project/issues/80416 and
* https://github.com/llvm/llvm-project/issues/94328