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A forthcoming CL will add the symbols to the binary, but will also
enforce their ordering, so the orderfile has to contain these symbols
first.
Adding the symbols early is not an issue, as linkers ignore unkown
entries.

Bug: 758566
Change-Id: I6580738f754067ce74acecd5deb796da246bf57d
Reviewed-on: https://chromium-review.googlesource.com/893142Reviewed-by: Matthew Cary <mattcary@chromium.org>
Reviewed-by: Egor Pasko <pasko@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532878}