[mips][wasm-simd][liftoff] Implement some simd ops in liftoff on mips64

We don't have mips32 CPU or 32-bits OS, so we are not going to implement
these functions on mips32.

Change-Id: Ie37e5cea360526a82bbbc52ec3933d74c32fea6d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2167741Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#67465}