Yesterday I added a call to memmove in CSA for pointer arrays when they
are in new space and the concurrent marker isn't running (protected by
mask kPointersFromHereAreInteresting, CL here:
https://chromium-review.googlesource.com/c/v8/v8/+/1243104/12). The bug
was that I didn't emit the check if dealing with a SMI array. However,
the GC subsystem at that point doesn't distinguish between SMI and
OBJECT FixedArrays. This fix brings the CSA code in line with that.

R=ulan@chromium.org

Bug: v8:8294
Change-Id: I9eb033c358911e8337562dbc91af8f0e6fbd2ed3
Reviewed-on: https://chromium-review.googlesource.com/c/1278386Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56598}