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It's currently lacking comments. This commit adds some, which is useful because there are some methods with non-obvious behaviour. The commit also renames two things: - `patch_map` becomes `term_patch_map`, because it's only about terminators. - `is_patched` becomes `is_term_patched`, for the same reason. (I would guess that originally `MirPatch` only handled terminators, and then over time it expanded to allow other modifications, but these names weren't updated.)