This CL introduces VOR and VSRO opcodes which get used
for implementing F64x2Splat, I64x2Splat and F32x4Splat.

Change-Id: I64b4cd340fbe9ecf6a789a91e3219b6ad83ce3f3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2184830Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#67627}