Refactor optimization defaults (#1366)

Followup to #1357. This moves the optimization settings into pass.h, and uses it from there in the various places.

This also splits up huge lines from the tracing code, which put all block children (whose number can be arbitrarily large) on one line. This seems to have caused random errors on the bots, I suspect from overflowing a buffer. Anyhow, it's much more clear to split the lines at a reasonable length.

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