SIMD lowering can result in int64 nodes (from i64x2), and int64 nodes
won't create SIMD nodes. So run SIMD lowering first, then int64
lowering.

Bug: v8:10507
Change-Id: Id720d98eda0bcd9ab441df687f974fd84bf9118c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2393497Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69756}