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a1daa34ad0
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.