Use `MirPatch` in `EnumSizeOpt`.

Instead of `expand_statements`. This makes the code shorter and
consistent with other MIR transform passes.

The tests require updating because there is a slight change in
MIR output:
- the old code replaced the original statement with twelve new
  statements.
- the new code inserts converts the original statement to a `nop` and
  then insert twelve new statements in front of it.

I.e. we now end up with an extra `nop`, which doesn't matter at all.

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