Revert "Remove one invocation of the ARC optimizer."
Revert "Remove one invocation of the ARC optimizer."

This reverts commit 0515889cf00f92643affad5142a8d95cd6db8abe.

I made a mistake and did not catch this regression when I measured the change on
my local machine. The regression was detected by our automatic performance
tests. Thank you @slavapestov for identifying the commit.

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