Consistently using word sized loads on all architectures.

Original port: ea420655


Change-Id: I1083b977eb3c1688e67d68a69a9311bafbb52584
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1663994
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#62259}