[semantic-arc-opts] Make sure to only run this pass when optimization is enabled even though it is running during the mandatory passes (for now).
[semantic-arc-opts] Make sure to only run this pass when optimization is enabled even though it is running during the mandatory passes (for now).

The idea is that eventually down the line we will split this pass into a
mandatory/performance parts once ownership SSA is eliminated after the
guaranteed passes run. For now though, just run this when optimization is
enabled.

This pass only runs on the stdlib/overlays so far so there shouldn't have been
any slow downs in non-stdlib -Onone builds.

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