[GR-76331] Fix co_lines deduplication and continuity.#926
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This change fixes a bug blocking GR-75854. The deduplication step did not apply to the final entry, so when we give the epilog the same line as the return, co_lines was producing two entries with the same line. I simplified the logic a bit to emit the "previous" entry on line change instead of the "new" entry.
I also made sure the instruction ranges are continuous. Previously,
[i, j, X], [j, k, X], [k, l, Y]would produce[i', j', X], [k', l', Y], but now it produces[i', k', X], [k', l', Y].