This Cl optimizes 64bit FP min/max using scalar VSX instructions.
FP values are always stored in DP format in a FP register which
means 32bit FP min/max ops will also benefit from this change.

Change-Id: I181e61b2d28ddf6920b548d33cb4d926da856be8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3086023
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#76212}