Some extract lane and replace lane opcodes overlap with the ones used
for load lane, with a different addressing mode. Merge those cases
together and delete unused opcodes.

Drive by clean-up to rename kF32x4ReplaceLane to kIA32Insertps to follow
the naming convetion (kIA32 prefix) and also make it more general if in
the future we use insertps for other purposes.

Bug: v8:10975
Change-Id: Id143670f63e69cb45cf7c1ce358297a928383035
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2568924Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71605}