LoadTransform cannot efficiently be executed on BE machines as a
single operation since loaded bytes need to be reversed to
match BE ordering before any operations can take place.

This CL divides LoadTransform into separate "load" and "operation"
nodes on BE machines.

Change-Id: Idc3f66d7f17647c189c75593e8906f8645448006
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2050811
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66264}