Before adding more tests, refactor the (single) existing test to be
parameterized by the memory type. This makes it easier to write a single
test with different expectations on memory32 and memory64.

R=manoskouk@chromium.org

Bug: v8:10949
Change-Id: Iaa9bd3af82092d46797e2222cb1c68746200f374
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2544545Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71291}