Auto merge of rust-lang#8096 - xFrednet:0000-remove-lintcheck-log-file, r=matthiaskrgr

Remove lintcheck log and add `--filter` option to lintcheck

This PR removes the really outdated lintcheck log from this repo and adds a new `--filter` option to force warnings of a lint. This also ignores `allow` attributes. I believe that this is a good thing, as we'll see if suppressed false positives are also fixed by the changes.

---

#### Example:
```sh
$ cargo lintcheck --filter identity_op
```

#### Output
```
clippy 0.1.59 (460bef2 2021-12-08)

[..]/cargo-0.49.0/src/cargo/core/compiler/fingerprint.rs:1910:17 clippy::identity_op "the operation is ineffective. Consider reducing it to `(ret[0] as usize)`"
[..]/cargo-0.49.0/src/cargo/util/hex.rs:8:9 clippy::identity_op "the operation is ineffective. Consider reducing it to `num`"
[..]/libc-0.2.81/src/unix/linux_like/linux/mod.rs:2654:18 clippy::identity_op "the operation is ineffective. Consider reducing it to `(dev & 0x00000000000000ff)`"
[..]/libc-0.2.81/src/unix/linux_like/linux/mod.rs:2665:16 clippy::identity_op "the operation is ineffective. Consider reducing it to `(minor & 0x000000ff)`"
[..]/libc-0.2.81/src/unix/linux_like/mod.rs:1218:27 clippy::identity_op "the operation is ineffective. Consider reducing it to `IPOPT_CONTROL`"
[..]/rayon-1.5.0/src/slice/quicksort.rs:588:17 clippy::identity_op "the operation is ineffective. Consider reducing it to `len / 4`"
[..]/regex-1.3.2/src/dfa.rs:1380:14 clippy::identity_op "the operation is ineffective. Consider reducing it to `(empty_flags.start as u8)`"

Stats:
clippy::identity_op 7
ICEs:
```
Two of these lints are suppressed when lintcheck runs normally

---

changelog: none

r? `@matthiaskrgr` Feel free to reassign if you think that someone else would be a better reviewer :upside_down_face:

Author: bors

.gitignore

@@ -27,9 +27,11 @@ out
 # Generated by dogfood
 /target_recur/
 
+# Generated by lintcheck
+/lintcheck-logs
+
 # gh pages docs
 util/gh-pages/lints.json
-**/metadata_collection.json
 
 # rustfmt backups
 *.rs.bk