The newly optimised CopyDataPropertiesWithExcludedProperties acceses the
excluded properties directly on the stack, to avoid pushing them twice.
This meant that we had to pass a stack pointer into the runtime, which
we couldn't do directly because all arguments to runtime functions
should be tagged.

We tried to work around this by passing the stack pointer in a Foreign,
but this violated the V8 sandbox. Fortunately, the stack pointer is
aligned, so it looks like a Smi to the GC. So, we can pass it directly
on the stack as a runtime argument but doing a bit of bitcasting.

Cq-Include-Trybots: luci.v8.try:v8_linux64_heap_sandbox_dbg_ng
Bug: v8:11614
Change-Id: I87c4a34a15ae863277142aa29f48b1dd546014e0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3497745
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79369}