This gives us an extra rustc-src.tar.xz, which is 33% smaller than the .tar.gz!

These are exactly the same as `print!` and `println!` except that
they write to stderr instead of stdout.  Issue rust-lang#39228.

 * Factor out the nigh-identical bodies of `_print` and `_eprint` to a helper
   function `print_to` (I was sorely tempted to call it `_doprnt`).
 * Update the issue number for the unstable `eprint` feature.
 * Add entries to the "unstable book" for `eprint` and `eprint_internal`.
 * Style corrections to the documentation.

There's no shell interpreting the file paths under the new Rusty
rust-installer, so we don't need to use `sanitize_sh` for it.  Plus,
the drive-letter transformation is actually harmful for the now-native
Windows rust-installer to understand those paths.

Pulls in crucial dependency updates which fix a serious RLS bug

Add `eprint!` and `eprintln!` macros to the prelude.

These are exactly the same as `print!` and `println!` except that they write to stderr instead of stdout.  Issues rust-lang#39228 and rust-lang#40528; previous PR rust-lang#39229; accepted RFC rust-lang/rfcs#1869; proposed revision to The Book rust-lang/book#615.

I have _not_ revised this any since the original submission; I will do that later this week.  I wanted to get this PR in place since it's been quite a while since the RFC was merged.

Known outstanding review comments:

* [x] @steveklabnik requested a new chapter for the unstable version of The Book -- please see if the proposed revisions to the second edition cover it.
* [x] @nodakai asked if it were possible to merge the internal methods `_print` and `_eprint` - not completely, since they both refer to different internal globals which we don't want to expose, but I will see if some duplication can be factored out.

Please let me know if I missed anything.

…ichton

Windows io::Error: also format NTSTATUS error codes

`NTSTATUS` errors may be encoded as `HRESULT`, see [[MS-ERREF]](https://msdn.microsoft.com/en-us/library/cc231198.aspx). These error codes can still be formatted using `FormatMessageW` but require some different parameters to be passed in.

I wasn't sure if this needed a test and if so, how to test it. Presumably we wouldn't want to make our tests dependent on localization-dependent strings returned from `FormatMessageW`.

Users that get an `err: NTSTATUS` will need to do `io::Error::from_raw_os_error(err|0x1000_0000)` (the equivalent of [`HRESULT_FROM_NT`](https://msdn.microsoft.com/en-us/library/ms693780(VS.85).aspx))

More Queries for Crate Metadata

This covers a little bit of clean up and the following parts of rust-lang#41417:
* `fn item_attrs(&self, def_id: DefId) -> Vec<ast::Attribute>;`
* `fn fn_arg_names(&self, did: DefId) -> Vec<ast::Name>;`
* `fn trait_of_item(&self, def_id: DefId) -> Option<DefId>;`
* `fn impl_parent(&self, impl_def_id: DefId) -> Option<DefId>;`
* ` fn is_foreign_item(&self, did: DefId) -> bool;`
* `fn is_exported_symbol(&self, def_id: DefId) -> bool;`

r? @nikomatsakis

…richton

Update to the Rusty rust-installer

This updates the rust-installer submodule to the new version written in Rust (rust-lang/rust-installer#62), now moved to `src/tools/rust-installer` and invoked in `dist.rs` as a cargo-based tool command.  All of the former shell-script invocations now invoke the tool, otherwise keeping the same arguments as before.

As a small bonus, `rustc-src` now also uses the same tarball generator, so it gains a smaller `.tar.xz` too.

Fixes rust-lang#41569.  r? @alexcrichton

…alexcrichton

ci: Update android ndk and sdk

Make install-sdk.sh and install-ndk.sh more generic so future updates can be made directly on Dockerfile. Update ndk to r13b, which will be necessary to make host builds for android (in the future). Update sdk to r25.2.5 (maybe some emulator performance improvement).

…hton

Add disabled android host builders

Introduce the concept of disabled builder. A disabled builder is one that is not run by travis. It is intended to be run by the user who wants a rustc for a tier 2 or 3 platform. Off corse, there is no guarantee that it will work.

…ookup, r=nikomatsakis

ICH: Handle case of removed FileMaps.

This PR fixes a bug introduced in rust-lang#41709 where removing a source file between compilation sessions would cause an ICE:
https://travis-ci.org/rust-icci/crossbeam/jobs/230582234#L633

r? @nikomatsakis

…ister

compiletest: force GDB to print values in the Rust format.

Based on @nodakai's rust-lang#40557 (comment) and @infinity0's rust-lang#40557 (comment).
Fixes rust-lang#40557.

Remove debug message

It was added by me in rust-lang#41293. Sorry about that!

Thanks goes to @alexbool for finding it.

Update RLS

Pulls in crucial dependency updates which fix a serious RLS bug