This CL prepares the interpreter for 64-bit addresses. The offset (in
the memory immediate) can now be 64-bit, and also the index (from the
stack) will be 64-bit if memory64 is enabled.
memory.size will return a 64-bit constant under memory64.
memory.grow is a bit more involved and requires more refactorings in the
called functions. I left a TODO in the interpreter for now.

R=manoskouk@chromium.org

Bug: v8:10949
Change-Id: I47ab7e38a7356239c827619325f4583069e46669
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2555000
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71376}