Martin Nordholts 52b19f7dda compiler: Don't mark SingleUseConsts MIR pass as "required for soundness"
Because:
* Something like it did not exist before PR 107404
* That it is not run our mir-opt-level 0 indicates that it is not
  required for soundness
* Its `MirPass::can_be_overridden()` is unchanged and thus returns true,
  indicating that it is not a required MIR pass.
* No test fails in PR 151426 that stops enabling by default in non-optimized builds

As can be seen from the updated test `tests/mir-opt/optimize_none.rs`,
this means that `#[optimize(none)]` functions become even less
optimized. As expected and as desired.
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