References in code objects to new-space embedded objects have to be
recorded in a remembered set so that they get updated by the garbage
collector.

TEST=cctest/test-serialize/CodeSerializerEmbeddedObject

R=ulan@chromium.org, yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2200333004
Cr-Commit-Position: refs/heads/master@{#38335}