Add debug-info to access variables from generator state

Include bounds from promoted constants in NLL

Previously a promoted function wouldn't have its bound propagated out to
the main function body.

When we visit a promoted, we now type check the MIR of the promoted
and transfer any lifetime constraints to back to the main function's MIR.

Fixes #57170

r? @nikomatsakis

Add support for using a jobserver with Rayon

The Rayon changes are here: https://github.com/Zoxc/rayon/pull/2

cc @alexcrichton
r? @nikomatsakis

Update edition-guide

15 commits in 419edb885ec1a98c0747b3907003d79e3e6b93a9..5f3cc2a5618700efcde3bc00799744f21fa9ad2e
2018-12-04 16:43:38 -0500 to 2019-02-27 20:11:50 -0800
- Migrate to mdbook 0.2. (rust-lang-nursery/edition-guide#152)
- Remove automatic deployment. (rust-lang-nursery/edition-guide#151)
- Fix issue with rust's linkchecker and mdbook. (rust-lang-nursery/edition-guide#147)
- Fix test now that overflowing_literals is rejected in all editions. (rust-lang-nursery/edition-guide#148)
- overflowing_literals is deny on all editions (rust-lang-nursery/edition-guide#146)
- Update for uniform_path stabilization. (rust-lang-nursery/edition-guide#141)
- Add example to rustup to show overriding to specific version (rust-lang-nursery/edition-guide#144)
- Update for anonymous-lifetime stabilization. (rust-lang-nursery/edition-guide#142)
- Add minimum Rust version for Kleene operator (rust-lang-nursery/edition-guide#137)
- Add 2018-specific changes. (rust-lang-nursery/edition-guide#130)
- aborting-on-panic.md: Typo in example config (rust-lang-nursery/edition-guide#125)
- Clarify uniform paths are not yet in Rust 2018 (rust-lang-nursery/edition-guide#124)
- update several version numbers
- Fixes outdated link (rust-lang-nursery/edition-guide#131)
- Fixed typo in transitioning page. (rust-lang-nursery/edition-guide#127)

Type annotations are shared between the MIR of a function and the
promoted constants for that function, so keep them in the type checker
when we check the promoted MIR.

Previously, a promoted that contains a function item wouldn't have the
function items bounds propagated to
the main function body.

Remove NodeId from more HIR nodes

The next iteration of HirIdification (#57578).

Removes `NodeId` from:

- [x] `Stmt`
- [x] `Local`
- [x] `Field`
- [x] `AnonConst`
- [x] `TraitItem`
- [x] `ImplItem`
- [x] `TypeBinding`
- [x] `Arg`
- [x] `TraitRef`
- [x] `VisibilityKind`

It will most probably break clippy again; I'd appreciate a **delegate** again if/when it is good to go so I can attach a clippy fix later.

r? @Zoxc

Put Local, Static and Promoted as one Base variant of Place

Related to #52708

The `Place` 2.0 representation use a `Base` variant for `Local`, `Static` and `Promoted` so we start making this change in the current `Place` to make the following steps simpler.

r? @oli-obk

Add unstable option to ignore should_panic tests

Add an unstable option `--exclude-should-panic` to libtest to workaround https://github.com/rust-lang/miri/issues/636

?r @oli-obk
cc @RalfJung

rustc: Update LLVM, remove dead wasm code

This commit updates the LLVM branch to the rebased version of the
upstream release/8.x branch. This includes a wasm patch which means that
the `rewrite_imports` pass in rustc is no longer needed (yay!) and we
can instead rely on `wasm-import-module`, an attribute we're already
emitting, to take care of all the work.

Introduce rustc_interface and move some methods there

Split out from https://github.com/rust-lang/rust/pull/56732

r? @oli-obk

Support defining C compatible variadic functions

## Summary

Add support for defining C compatible variadic functions in unsafe rust with
`extern "C"` according to [RFC 2137].

## Details

### Parsing
When parsing a user defined function that is `unsafe` and `extern "C"` allow
variadic signatures and inject a "spoofed" `VaList` in the new functions
signature. This allows the user to interact with the variadic arguments via a
`VaList` instead of manually using `va_start` and `va_end` (See [RFC 2137] for
details).

### Codegen

When running codegen for a variadic function, remove the "spoofed" `VaList`
from the function signature and inject `va_start` when the arg local
references are created for the function and `va_end` on return.

## TODO

 - [x] Get feedback on injecting `va_start/va_end` in MIR vs codegen
 - [x] Properly inject `va_end` - It seems like it should be possible to inject
       `va_end` on the `TerminatorKind::Return`. I just need to figure out how
       to get the `LocalRef` here.
 - [x] Properly call Rust defined C variadic functions in Rust - The spoofed
       `VaList` causes problems here.

Related to: #44930

r? @ghost

[RFC 2137]: https://github.com/rust-lang/rfcs/blob/master/text/2137-variadic.md

libstd => 2018

Transitions `libstd` to Rust 2018; cc #58099

r? @Centril