The previous pseudo-smi storage scheme for caching call target
addresses in a struct without requiring a custom visitor only
works on uncompressed 64-bit platforms. This patch fixes other
platforms (natural or compressed 32-bit) by boxing the address
in a Foreign.

Change-Id: I3c182c1d9ccae4858cac2757fc3daa40d1520998
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1771780
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63422}