… Book.

To explain some non-obvious things that took me some time to work out.

`EarlyLintPassObjects` is an old name.

As `*CombinedLateLintModPass`, because that matches things like
`late_lint_mod`.

We generally write `lint_pass`/`LintPass`. This commit renames some
things that only use `pass`/`Pass`. And also some `s/module/mod`
changes, too.

There are `register_*_lint_pass` methods, might as well go through them.

…le_trait, r=chenyukang

Cross-referencing tuple_trait tracking issue, source and the Unstable Book

…itor

tests: modify s390x vector test to be robust to instruction scheduling

A recent LLVM change causes some changes here, if I'm understanding correctly it allows some better latency reduction. From what I can tell, this test doesn't care that only a single register is used, so we use -DAG instead of -NEXT to allow some instruction reordering.

By happy coincidence, the z10 and z13 code matches now, which collapsed some of the test lines. I'm happy to split them back out if that's bad for some reason though!

…Urgau

More lint cleanups

Details in individual commits.

r? Urgau

…hnTitor

Add missing links in integer docs

Saw some missing links while browsing the docs so fixed that.