Prototype these 4 instructions:

- i64x2.widen_low_i32x4_s
- i64x2.widen_high_i32x4_s
- i64x2.widen_low_i32x4_u
- i64x2.widen_high_i32x4_u

Bug: v8:10972
Change-Id: I57508a7fcafdf3b8a9477d6e9292fbb6b67e3619
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2612342
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72029}