pshufb is a SSSE3 feature and so requires the scope before using.

Change-Id: I42cf252079ba9aa9b09c2197a0e20b90ebc27b5d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2500927Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70813}