Port 805df68f

Original Commit Message:

    Baseline write barrier needs to use different page flag mask to also
    call into the slow path of the barrier for old-to-shared pointers.

R=dinfuehr@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: I00c179ac04b74b1196951ae4d8c868d312d5a856
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3834633
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82543}