Enable "full tools" option on ARM dist builders

This commit switches the `--enable-extended` option on the arm-related
dist builders to `--enable-full-tools`. This alias in `config.py`
corresponds to enabling a few more options:

* `rust.lld = true` - this is the main purpose of this PR, to enable LLD
  on ARM-related platforms. This means it will effectively unlock
  compilation of wasm programs from an arm host.

* `rust.llvm-tools = true` - it turns out that this option is largely
  ignored in rustbuild today. This is only read in one location to set
  some flags for the `llvm-tools` package, but the `llvm-tools` package
  is already produced on all of these builders. It's predicted that this
  will have no effect on build times.

* `rust.codegen-backends = ['llvm']` - historically this also enabled
  the emscripten backend, but that has long since been removed.

This brings the ARM dist builders in line with the x86_64 dist builders
using this flag. The hope is that the extra time spent on CI building
LLD will acceptable because it's cached by `sccache`, LLD is a
relatively small C++ project, and the dist builders are all clocking
well under 3 hours (the slowest of all builders) around 2 hours.

There's likely some possible cleanup that can happen with these
configure options since it doesn't look like they've aged too too well,
but I'm hopeful that possible refactorings, if necessary, could be
deferred to future PRs.

Update cargo

11 commits in 8751eb3010d4cdb5329b5a6bd2b6d765c95b0dca..90931d9b31e8b854522fed00916504a3ac6d8619
2020-04-21 18:04:35 +0000 to 2020-04-28 01:56:59 +0000
- Use associated constants directly on primitive types instead of modules (rust-lang/cargo#8077)
- Clear `RUSTDOCFLAGS` before running tests (rust-lang/cargo#8168)
- Fix warning for `resolve` mismatch in workspace. (rust-lang/cargo#8169)
- Fix flaky linking_interrupted test. (rust-lang/cargo#8162)
- Fixed some unnecessary borrows and clones. (rust-lang/cargo#8146)
- Added warning when using restricted names in Windows. (rust-lang/cargo#8136)
- Add changelog about dylib uplift. (rust-lang/cargo#8161)
- Mention that cargo_metadata can parse json messages (rust-lang/cargo#8158)
- Re-enable rustc-info-cache test again (rust-lang/cargo#8155)
- Updates to path source walking. (rust-lang/cargo#8095)
- Bump to 0.46.0, update changelog (rust-lang/cargo#8153)

Rollup of 5 pull requests

Successful merges:

 - #71340 (Moving more build-pass tests to check-pass)
 - #71456 (Use lib crate type for SGX in `fn build_auxiliary`)
 - #71615 (share some common code for compile-time miri instances)
 - #71637 (Minor formatting changes in `cfg-sanitize.md`)
 - #71641 (Update books)

Failed merges:

r? @ghost

Update books

## nomicon

5 commits in 6eb24d6e9c0773d4aee68ed5fca121ce3cdf676a..4d2d275997746d35eabfc4d992dfbdcce2f626ed
2020-04-06 02:21:15 +0200 to 2020-04-27 10:24:52 -0400
- Fix example in FFI, section NPO
- Update implementation code of `split_at_mut`
- Use rust-lang/rust linkchecker on CI.
- Use just `std::_` instead of `::std::_`
- Remove illegal space.

## reference

2 commits in 3ce94caed4cf967106c51ae86be5e098f7875f11..ed22e6fbfcb6ce436e9ea3b4bb4a55b2fb50a57e
2020-04-11 17:00:27 +0200 to 2020-04-24 12:46:22 -0700
- Fix grammer for tuple patterns and tuple struct patterns (rust-lang-nursery/reference#794)
- Document drop scopes (rust-lang-nursery/reference#514)

## book

2 commits in f5db319e0b19c22964398d56bc63103d669e1bba..e37c0e84e2ef73d3a4ebffda8011db6814a3b02d
2020-04-13 08:06:03 -0500 to 2020-04-26 09:31:36 -0500
- Mention short-circuiting in Appendix 02 (rust-lang/book#2318)
- Increase HTTP buffer size and add 'Content-Length' header (rust-lang/book#2246)

## rust-by-example

8 commits in c106d1683c3a2b0960f0f0fb01728cbb19807332..ffc99581689fe2455908aaef5f5cf50dd03bb8f5
2020-04-09 09:14:39 -0300 to 2020-04-24 15:05:04 -0300
- Fix Example -> Examples (rust-lang/rust-by-example#1340)
- Make unsuffixed literal plural (rust-lang/rust-by-example#1335)
- Ensure example error matches the comment (rust-lang/rust-by-example#1336)
- Add missing triple backticks (rust-lang/rust-by-example#1339)
- Clarify conditional compilation (rust-lang/rust-by-example#1338)
- Clarifies how to customize lib crate name (rust-lang/rust-by-example#1337)
- Fix bytes of youkoso in shiftjis (rust-lang/rust-by-example#1333)
- Fix possible typo (rust-lang/rust-by-example#1334)

## embedded-book

4 commits in 668fb07b6160b9c468f598e839c1e044db65de30..40beccdf1bb8eb9184a2e3b42db8b8c6e394247f
2020-04-13 12:38:16 +0000 to 2020-04-26 17:44:14 +0000
- Add hint on memory config to GDB debugging section  (rust-embedded/book#215)
- Adds cargo-generate to installation instructions  (rust-embedded/book#213)
- collections: Fix example allocator  (rust-embedded/book#206)
- Flip111/patch 8  (rust-embedded/book#233)

Minor formatting changes in `cfg-sanitize.md`

share some common code for compile-time miri instances

Fixes https://github.com/rust-lang/rust/issues/71129

r? @oli-obk

Use lib crate type for SGX in `fn build_auxiliary`

since SGX does not support `dylib`

cc @Goirad

Moving more build-pass tests to check-pass

One or two tests became build-pass without the FIXME because they really
needed build-pass (were failing without it).

Helps with #62277

---
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Rollup of 5 pull requests

Successful merges:

 - #71311 (On `FnDef` type annotation suggestion, use fn-pointer output)
 - #71488 (normalize field projection ty to fix broken MIR issue)
 - #71489 (Fix off by one in treat err as bug)
 - #71585 (remove obsolete comment)
 - #71634 (Revert #71372 ("Fix #! (shebang) stripping account space issue").)

Failed merges:

r? @ghost

Revert #71372 ("Fix #! (shebang) stripping account space issue").

While #71372 fixed some of the problems `#!`-stripping had, it introduced others:
* inefficient implementation (`.chars().filter(...).collect()` on the entire input file)
  * this also means the length returned isn't always correct, leading to e.g. #71471
* it ignores whitespace anywhere, stripping ` # ! ...` which isn't a valid shebang
  * the definition of "whitespace" it uses includes newlines, which means even `\n#\n!\n...` is stripped as a shebang (and anything matching the regex `\s*#\s*!\s*`, and not followed by `[`, really)
* it's backward-incompatible but didn't go through Crater

Now, #71487 is already open and will solve all of these issues. But for running Crater, and just in case #71487 takes a bit longer, I decided it's safer to just revert #71372.

This will also make #71372's diff clearer, as it will start again from the original whitespace-unaware version.

r? @petrochenkov

remove obsolete comment

Not sure if it's better to have an outdated comment or no comment at all (made obsolete by 2b9fea13).

Fix off by one in treat err as bug

`-Ztreat-err-as-bug` doesn't work properly with delay_span_bug.

r? @EddyB

normalize field projection ty to fix broken MIR issue

Fixes #71344

r? @EddyB

On `FnDef` type annotation suggestion, use fn-pointer output

Address the last point in #71209.

This reverts commit 46a8dcef, reversing
changes made to f28e3873.

smoke-test for async fn with mir-opt-level=0

MIR opt levels heavily influence which MIR transformations run, and we barely test non-default opt levels. I am particularly worried about `async fn` lowering and how it might (not) work when the set of preceding MIR passes changes -- see https://github.com/rust-lang/rust/pull/70073.

This adds some basic smoke testing, where at least a few `async fn` `run-pass` test are ensured to also work with mir-opt-level=0.

Convert more queries to use `LocalDefId`

This PR is based on commits in https://github.com/rust-lang/rust/pull/71215 and should partially solve #70853

Update RLS to unbreak toolstate

Breakage caused by https://github.com/rust-lang/rust/pull/71263.

r? @ghost

Rollup of 7 pull requests

Successful merges:

 - #67841 (Add Read/Write::can_read/write_vectored)
 - #71524 (Minimize parameter of coerce_borrowed_pointer())
 - #71558 (Cleanup and document `-Z tls-model` )
 - #71578 (linkchecker: fix typo in main.rs)
 - #71596 (Fix broken link in `QPath` documentation)
 - #71604 (make recursive-zst test unleashed)
 - #71605 (No need to whitelist E0750 anymore)

Failed merges:

r? @ghost

and `maybe_unused_trait_import` queries