Move everything past the Smi check and "pointers-from-here" check in the
write barrier into deferred code. This matches what TF does for
kArchStoreWithWriteBarrier.

Bug: v8:7700
Change-Id: I869e6d5c85c01a3e265abca6cfa6f86066c1ab96
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3764443Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81752}