The graph verifer caught this bug. The offset in a load instruction
should be pointer-sized.

Bug: v8:10605
Change-Id: I816165c9c9ef4f0d7fbdcaf9c70faf845dbbb9fd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2238016Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#68324}