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Prior to C++17, it's not defined if the LHS or RHS of an assignment
is evaluated first: the only that's defined is the evaluation of the
LHS and RHS happen before the assignment.

Bug: 805881
Change-Id: Ieece0dd53f174d82a8e32ff41418e894f0c27ddd
Reviewed-on: https://chromium-review.googlesource.com/899948Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534205}