This implements the `Linker::{link_whole_staticlib,link_whole_rlib}`
methods for the `WasmLd` linker used on wasm targets. Previously these
methods were noops since I think historically `wasm-ld` did not have
support for `--whole-archive` but nowadays it does, so the flags are
passed through.

explain how to go back to rustup-managed Miri

Fixes rust-lang/miri#2633

./miri updates: toolchain, rustc-push, rustc-pull

This merges the `./rustup-toolchain` script into `./miri` as `./miri toolchain`, and adds two new commands for josh-based syncing.

r? `@rust-lang/miri`

Stacked Borrows: make scalar field retagging the default

I think it is time to finally close this soundness gap. Any objections? :)

Unfortunately the latest released versions of hashbrown and scopeguard can fail under full field retagging. The fixes have landed in the git repos but have not been released yet. I don't know if scalar field retagging as enabled by this PR is sufficient to cause problems with these crates, but it seems likely that this would be the case -- e.g. if both `value` and `dropfn` are scalars, the entire scopeguard struct will be a `ScalarPair` and thus get field retagging.

However, given that we actually generate LLVM `noalias` for these cases, it seems prudent to inform users of this risk. They can easily set `-Zmiri-field-retag=none` to opt-out of this change.

Cc rust-lang/miri#2528

Rustup

Fix dupe word typos

…Jung

Followup for pr 2640

r? `@RalfJung`

fix ./miri bench

Fixes rust-lang/miri#2643

InitOnce: synchronize with completion when already complete

The completion of an InitOnce happens-before the threads waiting on it wake up. However, this is not the case for threads that call `InitOnceBeginInitialize` after the completion, leading to data races and outdated weak memory loads as observed in the CI for  rust-lang#2638. This PR fixes this.

Rustup

Implement condvars for Windows

Adds 3 shims for Windows: `SleepConditionVariableSRW`, `WakeConditionVariable`, `WakeAllConditionVariable` to add support for condvars (which fixes rust-lang#2628).

Salvaged from what was removed from rust-lang#2231

Fixes rust-lang#102576

Revert "lint auto pass"

This reverts commit e58e4466384924c491a932d3f18ef50ffa5a5065.

doc comment

trim old

Fixes rust-lang#95186.
Fixes rust-lang#95187.

…resent in base impl.

Allow specialized const trait impls.

Fixes rust-lang#95186.
Fixes rust-lang#95187.

I've done my best to create a comprehensive test suite for the interaction between `min_specialization` and `const_trait_impls`. I wouldn't be surprised if there are interesting cases I haven't tested, please let me know.

…redux, r=lcnr

Make `Sized` coinductive, again

A revival of rust-lang#83647

---

What exactly makes co-induction sound? Better question: are there any unsoundness risks from this? `Sized` can't be implemented by custom `impl` blocks, nor can it be conditionally implemented based on anything other than child fields being `Sized`, right?

r? `@nikomatsakis` for whenever he gets back from vacation

…ve, r=estebank

Implement the `+whole-archive` modifier for `wasm-ld`

This implements the `Linker::{link_whole_staticlib,link_whole_rlib}` methods for the `WasmLd` linker used on wasm targets. Previously these methods were noops since I think historically `wasm-ld` did not have support for `--whole-archive` but nowadays it does, so the flags are passed through.

…-parentheses, r=estebank

Fix unused lint and parser caring about spaces to won't produce invalid code

Fixes rust-lang#103435

…tebank

Suggest calling the instance method of the same name when method not found

Fixes rust-lang#103474

…idtwco

piece of diagnostic migrate

r? `@davidtwco`

update Miri

Notable PRs:
- rust-lang/miri#2636
- rust-lang/miri#2641
- rust-lang/miri#2638

…ble-trait, r=Manishearth

rustdoc: use javascript to layout notable traits popups

Fixes rust-lang#102576

Preview: https://notriddle.com/notriddle-rustdoc-demos/102576-js-notable-trait/std/iter/trait.Iterator.html#method.step_by

## Before

![image](https://user-images.githubusercontent.com/1593513/200432713-23aa8d49-ba2b-469f-9eab-089e0c174039.png)

## After

![image](https://user-images.githubusercontent.com/1593513/200432735-edd5b53d-e99d-4fc5-9410-8a79e0efdc9d.png)