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The same Sub is created a few lines above.

Cmp does not have Projs anymore, so is_simple_loop() directly returns the Cmp and there is no Proj to skip.

The second test should test role == invariant, not constant.

All callers pass loop_info.iteration_phi.

Some analysis parts create new nodes destroying the CONSISTENT_OUT_EDGES
property even though no real change has been performed.

Use the _r variants of set_cur_block() and [gs]et_value().

- Do not handle Bad. This is done by unreachable code elimination.
- Handle NoMem.