GitLab

Perhaps counterintuitively, Elf64_Word is 32 bits. Don't use it to
manipulate file sizes.

BUG=780860

Change-Id: I0a80e10b46400dcd0e0e43061755494267d67a06
Reviewed-on: https://chromium-review.googlesource.com/954326
Commit-Queue: Michael Moss <mmoss@chromium.org>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544032}