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We only need to know that we can eveluate the constant. In non-summaries world we have the resolved unit anyway. But in case of summaries we don't, but we know that all the constant expressions are resynthesized as resolved (even if lazily). R=brianwilkerson@google.com, paulberry@google.com BUG= Review URL: https://codereview.chromium.org/1673913002 .