Properly use pass options in nested pass runners (up to -O1) (#5351)

This fixes a TODO.

There is a runtime cost to this in higher opt levels, as passing through -O3
makes nested optimization work take longer. But it can lead to better results.
For now, this PR moves us from 0 before to a maximum of 1, as a compromise.
1 does not regress compile times, but there may be further benefits to allowing
2 and 3 in the future.

Also fix a fuzzer bug that becomes uncovered by tihs PR: Now that we actually
optimize in simplify-globals, we need to handle the case of the optimizer there
seeing a call with the effects of writing to a global (we had an assert on that
never happening, but with function effects that can happen, and so a GlobalSet
is not the only thing that can set a global).

Aside from the opt and shrink levels this passes through all other options,
like trapsNeverHappen.

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