Move non clean impls items

[GuillaumeGomez]

This is another (and should be the last for the clean module) rustdoc cleanup.

I tried to follow the same commit pattern as the last one to make the review as easy as possible.

r? @kinnison

[rust-highfive]

The job x86_64-gnu-llvm-7 of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

2019-12-09T17:08:38.2168664Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-12-09T17:08:38.2182446Z ##[command]git config gc.auto 0
2019-12-09T17:08:38.2187783Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-12-09T17:08:38.2191739Z ##[command]git config --get-all http.proxy
2019-12-09T17:08:38.2196939Z ##[command]git -c http.extraheader="AUTHORIZATION: basic ***" fetch --force --tags --prune --progress --no-recurse-submodules --depth=2 origin +refs/heads/*:refs/remotes/origin/* +refs/pull/67178/merge:refs/remotes/pull/67178/merge
---
2019-12-09T17:14:36.6984230Z    Compiling serde_json v1.0.40
2019-12-09T17:14:38.4397286Z    Compiling tidy v0.1.0 (/checkout/src/tools/tidy)
2019-12-09T17:14:49.2968381Z     Finished release [optimized] target(s) in 1m 27s
2019-12-09T17:14:49.3078959Z tidy check
2019-12-09T17:14:50.3250774Z tidy error: /checkout/src/librustdoc/clean/mod.rs: ignoring file length unnecessarily
2019-12-09T17:14:52.0903370Z some tidy checks failed
2019-12-09T17:14:52.0904935Z Found 485 error codes
2019-12-09T17:14:52.0905363Z Found 0 error codes with no tests
2019-12-09T17:14:52.0905553Z Done!
2019-12-09T17:14:52.0905553Z Done!
2019-12-09T17:14:52.0905687Z 
2019-12-09T17:14:52.0905814Z 
2019-12-09T17:14:52.0906831Z command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/tidy" "/checkout/src" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/bin/cargo" "--no-vendor"
2019-12-09T17:14:52.0907247Z 
2019-12-09T17:14:52.0907379Z 
2019-12-09T17:14:52.0915595Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-12-09T17:14:52.0915691Z Build completed unsuccessfully in 0:01:31
2019-12-09T17:14:52.0915691Z Build completed unsuccessfully in 0:01:31
2019-12-09T17:14:52.0968142Z == clock drift check ==
2019-12-09T17:14:52.0979072Z   local time: Mon Dec  9 17:14:52 UTC 2019
2019-12-09T17:14:52.3917766Z   network time: Mon, 09 Dec 2019 17:14:52 GMT
2019-12-09T17:14:52.3917925Z == end clock drift check ==
2019-12-09T17:14:53.7084612Z 
2019-12-09T17:14:53.7186971Z ##[error]Bash exited with code '1'.
2019-12-09T17:14:53.7214346Z ##[section]Starting: Checkout
2019-12-09T17:14:53.7215944Z ==============================================================================
2019-12-09T17:14:53.7215996Z Task         : Get sources
2019-12-09T17:14:53.7216056Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[kinnison]

Visually this looks sane, Thank you for making it easy review.

You did end up shunting a couple of functions around a bit, but I'm okay with that, it was easy enough to confirm.

You have a tidy error to fix before I can approve fully.

[GuillaumeGomez]

Fixed tidy so let's move! :D

@bors: r=kinnison

[bors]

📌 Commit f0babc8 has been approved by kinnison