Convert Low I32x4 (S/U) to FP is changed to use
`Round to nearest with ties to even` which is used by ConvertI32x4
as well as the scalar variant ConvertIntToFloat.

Change-Id: Idcb235bdf7fcd43304af785713a4988986db3544
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3032262Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#75762}