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.

rustc_mir: calc hex number length without string allocation

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)

Rollup of 6 pull requests

Successful merges:

 - #86558 (Add suggestions for "undefined reference" link errors)
 - #86616 (rustc_span: Explicitly handle crates that differ from package names)
 - #86652 (Add support for leaf function frame pointer elimination)
 - #86666 (Fix misleading "impl Trait" error)
 - #86762 (mailmap: Add my work email address)
 - #86773 (Enable the tests developed with #86594)

Failed merges:

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

Enable the tests developed with #86594

This PR requires `browser-ui-test@0.4.1`. Can we centralise the version number somehow and maybe automatically install it when tests are run?

r? `@GuillaumeGomez`

mailmap: Add my work email address

This de-duplicates the entry on the thanks.

Fix misleading "impl Trait" error

The kinds can't be compared directly, as types with references are treated as different because the lifetimes aren't bound in ty, but are in expected.
Closes #84160

Add support for leaf function frame pointer elimination

This PR adds ability for the target specifications to specify frame
pointer emission type that's not just “always” or “whatever cg decides”.

In particular there's a new mode that allows omission of the frame
pointer for leaf functions (those that don't call any other functions).

We then set this new mode for Aarch64-based Apple targets.

Fixes #86196

rustc_span: Explicitly handle crates that differ from package names

The sha-1 and md-5 packages contain crates named sha1 and md5,
respectively. This discrepancy makes it somewhat more challenging to
automate detection of unused crates. Explicitly rename the packages to
the names of the crates they contain, to simplify such detection.

Add suggestions for "undefined reference" link errors

This adds a suggestion for "undefined reference to ..." linking errors to install or specify the location to an external library. Since there is no defined error format for linkers, we just check if there was a failure and if that failure contains the string `undefined reference to`. This also makes it impossible to test this, since the output depends on the system linker. The output now looks like:
```
error: linking with `cc` failed: exit status: 1
  |
  = note: "cc" "-m64" "linking_failure.linking_failure.7rcbfp3g-cgu.0.rcgu.o" "linking_failure.linking_failure.7rcbfp3g-cgu.1.rcgu.o" "linking_failure.linking_failure.7rcbfp3g-cgu.2.rcgu.o" "linking_failure.linking_failure.7rcbfp3g-cgu.3.rcgu.o" "linking_failure.linking_failure.7rcbfp3g-cgu.4.rcgu.o" "linking_failure.linking_failure.7rcbfp3g-cgu.5.rcgu.o" "linking_failure.linking_failure.7rcbfp3g-cgu.6.rcgu.o" "linking_failure.linking_failure.7rcbfp3g-cgu.7.rcgu.o" "linking_failure.linking_failure.7rcbfp3g-cgu.8.rcgu.o" "linking_failure.53u64zklswtfazes.rcgu.o" "-Wl,--as-needed" "-L" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,--start-group" "-Wl,-Bstatic" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-01ce3ba5c629d02f.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-f1f2102409186354.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-1e8b6b56a999f838.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-d0e93eb4e14f1d19.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-1d7e39d75d082b43.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-ade42e945045b261.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-1a65064fccf4ebc1.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-4d699c310fdfe72d.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-1cafa68a696ec800.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-e9f1c8c4dab2f046.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-ecc1a743be25c7f7.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-e074031c4b66b6b6.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-9aa6ed9f1d3bfd53.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-7862bf96c2250ca0.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-f02ce0dc7895b5fd.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-3af9c60917570521.rlib" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-ca16fc7bb3645684.rlib" "-Wl,--end-group" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-d8e1a5b7299604cc.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-znoexecstack" "-L" "/home/smit/rustc-dev/rust/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "linking_failure" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs"
  = note: /usr/bin/ld: linking_failure.linking_failure.7rcbfp3g-cgu.3.rcgu.o: in function `linking_failure::main':
          linking_failure.7rcbfp3g-cgu.3:(.text._ZN15linking_failure4main17h52b6e3052e444479E+0x3): undefined reference to `doesnt_exist_thiwthwfyl'
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

  = help: some `extern` functions couldn't be found; you may need to install or specify the path to some dependencies
  = note: use the -L flag to specify the library lookup path
  = note: use the cargo:rustc-link-search directive to specify the library lookup path with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#rustc-link-search)

error: aborting due to previous error
```

Fix ICE when `main` is declared in an `extern` block

Changes in #84401 to implement `imported_main` changed how the crate entry point is found, and a declared `main` in an `extern` block was detected erroneously.  This was causing the ICE described in #86110.

This PR adds a check for this case and emits an error instead.  Previously a `main` declaration in an `extern` block was not detected as an entry point at all, so emitting an error shouldn't break anything that worked previously.  In 1.52.1 stable this is demonstrated, with a `` `main` function not found`` error.

Fixes #86110

Remove unused dependencies from compiler crates

Various compiler crates have dependencies that they don't appear to use. I used some scripting to detect such dependencies, filtered them based on some manual review, and removed those that do indeed appear to be entirely unused.

Rollup of 8 pull requests

Successful merges:

 - #85504 (the foundation owns rust trademarks)
 - #85520 (Fix typo and improve documentation for E0632)
 - #86680 (Improve error for missing -Z with debugging option)
 - #86728 (Check node kind to avoid ICE in `check_expr_return()`)
 - #86740 (copy rust-lld as ld in dist)
 - #86746 (Fix rustdoc query type filter)
 - #86750 (Test cross-crate usage of `feature(const_trait_impl)`)
 - #86755 (alloc: `RawVec<T, A>::shrink` can be in `no_global_oom_handling`.)

Failed merges:

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

Simplify early compilation interface

* separate resolver creation and AST configuration.
* bundle lowering with global_ctxt creation.

alloc: `RawVec<T, A>::shrink` can be in `no_global_oom_handling`.

Found in https://github.com/Rust-for-Linux/linux/pull/402.
Signed-off-by: NMiguel Ojeda <ojeda@kernel.org>

Test cross-crate usage of `feature(const_trait_impl)`

This PR does two things:

 - Fixes metadata not encoded properly for functions in const trait impls.
 - Adds tests for using const trait impls cross-crate with the feature gate on the user crate either enabled or disabled.

AFAIK, this means we can now constify some trait impls in the standard library 🎉

See #67792 for the tracking issue, cc `@oli-obk`

Fix rustdoc query type filter

I realized while reviewing #86659 that the type filter was broken on search so I'd prefer it to get merged before merging #86659.

r? `@notriddle`

copy rust-lld as ld in dist

Fixes bug in https://github.com/rust-lang/rust/pull/85961. Linking seems to work for pure Rust projects, but not when a C library needs to be dynamically linked.

Check node kind to avoid ICE in `check_expr_return()`

This PR fixes #86721. The ICE described there is apparently due to a misunderstanding:
https://github.com/rust-lang/rust/blob/e98897e5dc9898707bf4331c43b2e76ab7e282fe/compiler/rustc_typeck/src/check/expr.rs#L684-L685

Intuitively, one would think that calling `expect_item()` after `get_parent_item()` should succeed, but as it turns out, `get_parent_item()` can also return foreign, trait, and impl items as well as crates, whereas `expect_item()` specifically expects a `Node::Item`. I have therefore added an extra check to prevent this ICE.

Improve error for missing -Z with debugging option

Before:
```text
❯ rustc --unpretty=hir
error: Unrecognized option: 'unpretty'
```
After:
```text
❯ rustc --unpretty=hir
error: Unrecognized option: 'unpretty'. Did you mean `-Z unpretty`?
```

Fix typo and improve documentation for E0632

Edit: After https://github.com/rust-lang/rust/pull/85520#issuecomment-870095546, this PR has been boiled down to just an extended description for `E0632` and a fixed typo.

the foundation owns rust trademarks