Extract code sequence for v64x2.alltrue into macro-assembler for sharing
between TurboFan and Liftoff.

Bug: v8:11347,v8:11348
Change-Id: I8119f5425c8cf11ddac77f69ed9e62a408f7049d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2686011
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72681}