[dev.simd] test: add some trickier cases to ternary-boolean simd test
These new tests check a hypothesis about interactions
between CPU features and common subexpressions. Happily,
they hypothesis was not (yet) correct and the test did not
fail.
These are probably good to have in the corpus in case we
decide to tinker with the rewrite in the future, or if
someone wants to write a fuzzer and needs a little
inspiration.