Improve searching for XXX in tidy script (#3303)

Few places where previous version of tidy script cannot find XXX:
* inside one-line comment preceding by a few spaces;
* inside multiline comments (now it finds it if multiline comment starts
on the same line with XXX).

Change occurences of XXX found by new tidy script.
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of github.com:JIghtuse/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust
Merge branch 'master' of https://github.com/mozilla/rust