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Refactor: organize loops file into loops module (Delegated) `@flip1995` `@nahuakang` closes #6693 r? `@flip1995` As we talked about in the PM of Zulip, this PR is a delegated PR from `@nahuakang.` Changes from the last commit of #6693: 1. Unify the name of the main entries of all modules to check, that was pointed out [here](https://github.com/rust-lang/rust-clippy/pull/6693#discussion_r582897713) 2. Simplify ` check_for_loop_arg`, that was pointed out [here](https://github.com/rust-lang/rust-clippy/pull/6693#discussion_r582914044) and [here](https://github.com/rust-lang/rust-clippy/pull/6693#discussion_r582929910) 3. Resolve conflicts changelog: Refactor `loops.rs` file into `loops` module.