Co-authored-by: NRémy Rakic <remy.rakic+github@gmail.com>

Implement printing of stack traces on LLVM segfaults and aborts

Implement #79153

Based on discussion, try to extend the rust_backtrace=1 feature to handle segfault or aborts in the llvm backend

Update Clippy

Biweekly Clippy Update

r? `@Manishearth`

Include terminators in instance size estimate

For example, drop glue generated for struct below, doesn't have any
statements, only terminators. Previously it received an estimate of 0,
the new estimate is 13 (6+5 drop terminators, +1 resume, +1 return).

```rust
struct S {
    a: String,
    b: String,
    c: String,
    d: String,
    e: String,
    f: String,
}
```

Originally reported in https://github.com/rust-lang/rust/issues/69382#issue-569392141

Rollup of 7 pull requests

Successful merges:

 - #86148 (Check the number of generic lifetime and const parameters of intrinsics)
 - #86659 (fix(rustdoc): generics search)
 - #86768 (Add myself to mailmap)
 - #86775 (Test for const trait impls behind feature gates)
 - #86779 (Allow anyone to add or remove any label starting with perf-)
 - #86783 (Move Mutex::unlock to T: ?Sized)
 - #86785 (proc_macro/bridge: Remove dead code Slice type)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

proc_macro/bridge: Remove dead code Slice type

See https://github.com/rust-lang/rust/pull/85390#discussion_r662464868

Move Mutex::unlock to T: ?Sized

r? ``@mbrubeck``

cc https://github.com/rust-lang/rust/issues/81872

Allow anyone to add or remove any label starting with perf-

In order to fully realize planned changes to the performance tracking process, we'd like to allow anyone to change the perf related labels.

r? ``@Mark-Simulacrum``

Test for const trait impls behind feature gates

 - Make the previous cross-crate tests use revisions instead of being separate files
 - Added test for gating const trait impls.

cc ``@oli-obk`` ``@jonas-schievink``

Add myself to mailmap

fix(rustdoc): generics search

This commit adds a test case for generics, re-adds generics data
to the search index, and tweaks function indexing to use less space in JSON.

This partially reverts commit 14ca8944.

Check the number of generic lifetime and const parameters of intrinsics

This pull request fixes #85855. The current code for type checking intrinsics only checks the number of generic _type_ parameters, but does not check for an incorrect number of lifetime or const parameters, which can cause problems later on, such as the ICE in #85855, where the code thought that it was looking at a type parameter but found a lifetime parameter:
```
error: internal compiler error: compiler/rustc_middle/src/ty/generics.rs:188:18:
    expected type parameter, but found another generic parameter
```

The changes in this PR add checks for the number of lifetime and const parameters, expand the scope of `E0094` to also apply to these cases, and improve the error message by properly pluralizing the number of expected generic parameters.

Rename all_crate_nums query to crates and remove useless wrapper

Split out of https://github.com/rust-lang/rust/pull/86105

r? `@petrochenkov`

See https://github.com/rust-lang/rust/pull/85390#discussion_r662464868

rustc_mir: calc hex number length without string allocation

Rustup

r? `@ghost`

changelog: none

Don't suggest doc(hidden) or unstable variants in wildcard lint

Clippy's wildcard lint would suggest doc(hidden) and unstable variants for non_exhaustive enums, even though those aren't part of the public interface (yet) and should only be matched on using a `_`, just like potential future additions to the enum. There was already some logic to exclude a *single* doc(hidden) variant. This extends that to all hidden variants, and also hides `#[unstable]` variants.

See https://github.com/rust-lang/rust/pull/85746#issuecomment-868886893

This PR includes https://github.com/rust-lang/rust-clippy/pull/7406 as the first commit.

Here's the diff that this PR adds on top of that PR: https://github.com/m-ou-se/rust-clippy/compare/std-errorkind...m-ou-se:doc-hidden-variants

---

*Please write a short comment explaining your change (or "none" for internal only changes)*

changelog: No longer suggest unstable and doc(hidden) variants in wildcard lint. wildcard_enum_match_arm, match_wildcard_for_single_variants

This commit adds a test case for generics, re-adds generics data
to the search index, and tweaks function indexing to use less space in JSON.

This reverts commit 14ca8944.

Update cargo

9 commits in 9233aa06c801801cff75df65df718d70905a235e..4952979031e2cf1d901c817a32e25a156a19db4c
2021-06-22 21:32:55 +0000 to 2021-07-01 01:14:50 +0000
- Fix `BorrowMutError` when calling `cargo doc --open` (rust-lang/cargo#9531)
- Exclude `target` from content-indexing on Windows (rust-lang/cargo#9635)
- Temporarily ignore 2021 edition fix. (rust-lang/cargo#9642)
- Temporarily disable future_incompat tests. (rust-lang/cargo#9638)
- Include toolchain specification in error message (rust-lang/cargo#9625)
- Error when packaging with git dependencies without version (rust-lang/cargo#9612)
- simply 'if' block (rust-lang/cargo#9615)
- tidy some closures and iterators (rust-lang/cargo#9614)
- use 'writeln' instead of appending newline character (rust-lang/cargo#9620)

For example, drop glue generated for struct below, doesn't have any
statements, only terminators. Previously it received an estimate of 0,
the new estimate is 13 (6+5 drop terminators, +1 resume, +1 return).

struct S {
    a: String,
    b: String,
    c: String,
    d: String,
    e: String,
    f: String,
}

Originally reported in https://github.com/rust-lang/rust/issues/69382#issue-569392141

This fixes a bug where match_wildcard_for_single_variants produced a
bad suggestion where besides the missing variant, one or more hidden
variants were left.

This also adds tests to the ui-tests match_wildcard_for_single_variants
and wildcard_enum_match_arm to make sure that the correct suggestion is
produced.