Now that we have {to|from}_be_bytes the code can be simpler.

(Inspired by PR rust-lang#57740)

Since the generic-ness is only for the as_refs, might as well have std just compile the important part once instead of on every use.

I felt the description of forbid was misleading/incomplete without
mentioning how --cap-lints interacts with it.

The rustc "-g" CLI flag was miss documented to be a synonym of "-C
debug-level=2" and not the correct "-C debuginfo=2".

The rustc "-g" and "-o" fags are synonyms of the "-c" codegen flags.
This adds a link to the codegen docs for each synonym.

…r=Centril

Deny the `overflowing_literals` lint for all editions

The `overflowing_literals` was made deny by default for the 2018 edition by rust-lang#54507, however I'm not aware of any reason it can't be made deny by default for the 2015 edition as well.

…Zoxc

HirId-ify intravisit

A big step towards rust-lang#57578.

This affects mostly `hir::{collector, intravisit}` and `rustc::lint`.

Update Clippy, RLS and rustfmt

Update Clippy to rust-lang/rust-clippy@32ee306
Update RLS to rust-lang/rls@0d6f53e
Update rustfmt to rust-lang/rustfmt@d6829d6

r? @Manishearth @oli-obk

…=oli-obk

Use less explicit shifting in std::net::ip

Now that we have `{to|from}_be_bytes` the code can be simpler.

(Inspired by PR rust-lang#57740)

Don't use an allocation for ItemId in StmtKind

Monomorphize less code in fs::{read|write}

Since the generic-ness is only for the as_refs, might as well have std just compile the important part once instead of on every use.

…ts, r=oli-obk

Mention capping forbid lints

I felt the description of forbid was misleading/incomplete without
mentioning how --cap-lints interacts with it.

update miri

r? @oli-obk

Fixes rust-lang#58558

…RalfJung

Remove UB in pointer tests

UB found by Miri.

…albini

Bump the bootstrap compiler

This compiler includes rust-lang#58501, which fixes an annoying ICE while working on rustc itself.

r? @pietroalbini

…TimNN

Fix doc for rustc "-g" flag

The rustc `-g` CLI flag was miss documented to be a synonym of `-C debug-level=2` and not `-C debuglevel=2`. Also add links to the codegen docs for each synonym.

I am unsure of this will conflict with work on rust-lang#52938

…Centril

Add regression test for a specialization-related ICE (rust-lang#39448)

Closes rust-lang#39448.

This is my first time contributing, I hope I got everything right. :)

… r=Centril

librustc_codegen_llvm => 2018

Transitions `librustc_codegen_llvm` to Rust 2018; cc rust-lang#58099

r? @Centril

Explain a panic in test case net::tcp::tests::double_bind

Those who try to build libstd on the Windows Subsystem for Linux experience a single failing test, where the point of failure is an explicit but anonymous panic, as reported in rust-lang#49367
This commit somewhat explains why and allows diagnosing a little.

Add a note about 2018e if someone uses `try {` in 2015e

Inspired by rust-lang#58491, where a `try_blocks` example was accidentally run in 2015, which of course produces a bunch of errors.

What's the philosophy about gating for this?  The keyword is stably a keyword in 2018, so I haven't gated it for now but am not mentioning what the keyword _does_.  Let me know if I should do differently.

libstd => 2018

Transitions `libstd` to Rust 2018; cc rust-lang#58099