The code reads whatever the stack pointer points at, and only
later decides whether to use that value for anything.

Change-Id: I9930cb046c4fcb3ba0c931058a9c3dd75df482f0
Reviewed-on: https://chromium-review.googlesource.com/c/1443503Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59187}