dst may be the same register as src0/src1, so it shouldn't be
overwritten if we still need src0 and src1's values.

And the NaN was not properly canonicalized, this CL adds fmin/fmax
instructions to canonicalize the result.

Change-Id: Ia65829015eb6c4de160298719d694ca9490883b7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2465775Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#70519}