update miri

Fixes https://github.com/rust-lang/rust/issues/59059

r? @oli-obk

Only insert nodes which changes lint levels in the LintLevelMap

r? @EddyB

Replace TimeLine LLVM profiling with the self profiler

Moved issue tests to subdirs and normalised names

Consistency, decluttering, ease of navigation :-)

r? @Centril

Update cargo

6 commits in 95b45eca19ac785263fed98ecefe540bb47337ac..0e35bd8af0ec72d3225c4819b330b94628f0e9d0
2019-03-06 19:24:30 +0000 to 2019-03-13 06:52:51 +0000
- Make `hg` optional for tests. (rust-lang/cargo#6739)
- Fingerprint build script deps only for path packages. (rust-lang/cargo#6734)
- Add --quiet option for `cargo test` (rust-lang/cargo#6358)
- .gitignore should end with a newline. (rust-lang/cargo#6732)
- Emit warning on misspelled environment variables (rust-lang/cargo#6694)
- Update glob requirement from 0.2.11 to 0.3.0 (rust-lang/cargo#6724)

resolve: Simplify import resolution for mixed 2015/2018 edition mode

Non-controversial part of https://github.com/rust-lang/rust/pull/57745.

Before:

| Local edition (per-span) | Global edition (--edition) | Imports (`use foo;`)                                 | Absolute paths (`::foo`)                                 |
| ------------- |----------------|-----------------------------------------|------------------------------------------------|
| 2018          | Any            | Uniform                                 | Extern prelude                                 |
| 2015          | 2015           | Crate-relative                          | Crate-relative                                 |
| 2015          | 2018           | Crate-relative with fallback to Uniform (future-proofed to error if the result is not Crate-relative or from Extern prelude) | Crate-relative with fallback to Extern prelude |

After:

| Local edition (per-span) | Global edition (--edition) | Imports (`use foo;`)                                 | Absolute paths (`::foo`)                                 |
| ------------- |----------------|-----------------------------------------|------------------------------------------------|
| 2018          | Any            | Uniform                                 | Extern prelude                                 |
| 2015          | 2015           | Crate-relative                          | Crate-relative                                 |
| 2015          | 2018           | Crate-relative with fallback to Extern prelude | Crate-relative with fallback to Extern prelude |

I.e. only the behavior of the mixed local-2015-global-2018 mode is changed.
This mixed mode has two goals:
- Address regressions from https://github.com/rust-lang/rust/pull/56053#issuecomment-440826397.
Both "before" and "after" variants address those regressions.
- Be retrofit-able to "full 2015" edition (https://github.com/rust-lang/rust/pull/57745).
Any more complex fallback scheme (with more candidates) than "Crate-relative with fallback to Extern prelude" will give more regressions than https://github.com/rust-lang/rust/pull/57745#issuecomment-455855089 and is therefore less retrofit-able while also being, well, more complex.
So, we can settle on "Crate-relative with fallback to Extern prelude".

(I'll hopefully proceed with https://github.com/rust-lang/rust/pull/57745 after mid-February.)

r? @Centril

Use derive macro for HashStable

Blocked on https://github.com/rust-lang/rust/pull/56795

Rollup of 16 pull requests

Successful merges:

 - #58829 (librustc_interface: Update scoped-tls to 1.0)
 - #58876 (Parse lifetimes that start with a number and give specific error)
 - #58908 (Update rand version)
 - #58998 (Fix documentation of from_ne_bytes and from_le_bytes)
 - #59056 (Use lifetime contravariance to elide more lifetimes in core+alloc+std)
 - #59057 (Standardize `Range*` documentation)
 - #59080 (Fix incorrect links in librustc_codegen_llvm documentation)
 - #59083 (Fix #54822 and associated faulty tests)
 - #59093 (Remove precompute_in_scope_traits_hashes)
 - #59101 (Reduces Code Repetitions like `!n >> amt`)
 - #59121 (impl FromIterator for Result: Use assert_eq! instead of assert!)
 - #59124 (Replace assert with assert_eq)
 - #59129 (Visit impl Trait for dead_code lint)
 - #59130 (Note that NonNull does not launder shared references for mutation)
 - #59132 (ignore higher-ranked object bound conditions created by WF)
 - #59138 (Simplify Iterator::{min, max})

Failed merges:

r? @ghost

Simplify Iterator::{min, max}

This PR simplifies the `select_fold1` helper method used to implmement `Iterator::{min, min_by, min_by_key, max, max_by, max_by_key}` by removing the projection argument, which was only used by the implementations of `min_by_key` and `max_by_key`.

I also added tests to ensure that the stability as mentioned in the comments of `min` and `max` is preserved, and fixed the `iter::{bench_max, bench_max_by_key}` benchmarks which the compiler presumably was able to collapse into closed-form expressions. None of the benchmark results were impacted, I suspect their generated assembly didn't change.

ignore higher-ranked object bound conditions created by WF

In the `issue-53548` test added in this PR, the `Box<dyn Trait>` type is expanded to `Box<dyn Trait + 'static>`, but the generator "witness" that results is `for<'r> { Box<dyn Trait + 'r> }`. The WF code was encountering an ICE (when debug-assertions were enabled) and an unexpected compilation error (without debug-asserions) when trying to process this `'r` region bound. In particular, to be WF, the region bound must meet the requirements of the trait, and hence we got `for<'r> { 'r: 'static }`. This would ICE because the `Binder` constructor we were using was assering that no higher-ranked regions were involved (because the WF code is supposed to skip those). The error (if debug-asserions were disabled) came because we obviously cannot prove that `'r: 'static` for any region `'r`.  Pursuant with
our "lazy WF" strategy for higher-ranked regions, the fix is not to require that `for<'r> { 'r: 'static }` holds (this is also analogous to what we would do for higher-ranked regions appearing within the trait in other positions).

Fixes #53548

r? @pnkfelix

Note that NonNull does not launder shared references for mutation

See https://users.rust-lang.org/t/relative-pointer-an-abstraction-to-build-movable-self-referential-types/26186/6

Visit impl Trait for dead_code lint

Fix #59085.

Replace assert with assert_eq

Use `assert_eq!` instead of `assert!` for the tests

impl FromIterator for Result: Use assert_eq! instead of assert!

Reduces Code Repetitions like `!n >> amt`

Fixes #49937 .
This PR contains defining a function which operates bit inversion and reducing bit operation like `!0u128 >> (128 - size.bits())`.