[compiler] Replace another std::unique_ptr with base::Optional
This replaces four heap allocations by one stack allocated value. R=mstarzinger@chromium.org Change-Id: I7d00968d7bddadb51d7c7b1f3bc5253e54c8a3f9 Reviewed-on: https://chromium-review.googlesource.com/574025 Commit-Queue: Clemens Hammacher <clemensh@chromium.org> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#46704}
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