After preparing Liftoff, TurboFan, and the interpreter for this change,
we now store the memory offset as uint64_t. {LoadLane} and {StoreLane}
were added after the TurboFan refactoring, so those two are adapted
similar to the other memory operations.

TBR=manoskouk@chromium.org

Bug: v8:10949
Cq-Include-Trybots: luci.v8.try:v8_win64_msvc_rel_ng
Change-Id: I8f3084c21a7d99f72df1bc18c2b507c4e84570cd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2560720
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71411}