The memory size is always stored as 32 bit value, so the comparison
should always be done in 32 bit space.

R=ahaas@chromium.org

Change-Id: Ic059e63bf1dc9e8bf568dbb5f8d7ccde1da4761a
Reviewed-on: https://chromium-review.googlesource.com/832473Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50187}