Drive-by: dtype and stype are removed from SIMD_UNOP_LIST,
toSimd() requires them to all be of type `fp`.

Change-Id: Ifdfe187e2b143fb8fa785c44344bea38ea7e10f8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3916553
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#83431}