This reduces the amount of git history downloaded from ~67M to ~11M.

avoid suggesting the same name

sort candidates

fix a message

use `opt_def_id` instead of `def_id`

move `find_similarly_named_module_or_crate` to rustc_resolve/src/diagnostics.rs

Previously, there was no way to actually get binaries in
`build/$TARGET/stage1/bin` without building the standard library. This
makes it possible to build just the compiler. This can be useful when
the standard library isn't actually necessary for trying out your tests
(e.g. a bug that can be reproduced with only a `no_core` crate).

…ebank

suggestion for typoed crate or module

Previously, the compiler didn't suggest similarly named crates or modules. This pull request adds a suggestion for typoed crates or modules.

rust-lang#76208

before:

```
error[E0433]: failed to resolve: use of undeclared type or module `chono`
 --> src/main.rs:2:5
  |
2 | use chono::prelude::*;
  |     ^^^^^ use of undeclared type or module `chono`
```

after:

```
error[E0433]: failed to resolve: use of undeclared type or module `chono`
 --> src/main.rs:2:5
  |
2 | use chono::prelude::*;
  |     ^^^^^
  |     |
  |     use of undeclared crate or module `chono`
  |     help: a similar crate or module exists: `chrono`
```

…ocs, r=joshtriplett

Improve `std::thread::available_parallelism` docs

_Tracking issue: https://github.com/rust-lang/rust/issues/74479_

This PR reworks the documentation of `std::thread::available_parallelism`, as requested [here](rust-lang#89324 (comment)).

## Changes

The following changes are made:

- We've removed prior mentions of "hardware threads" and instead centers the docs around "parallelism" as a resource available to a program.
- We now provide examples of when `available_parallelism` may return numbers that differ from the number of CPU cores in the host machine.
- We now mention that the amount of available parallelism may change over time.
- We make note of which platform components we don't take into account which more advanced users may want to take note of.
- The example has been updated, which should be a bit easier to use.
- We've added a docs alias to `num-cpus` which provides similar functionality to `available_parallelism`, and is one of the most popular crates on crates.io.

---

Thanks!

r? `@BurntSushi`

Use shallow clones for submodules

This reduces the amount of git history downloaded for submodules from ~67M to ~11M. For comparison, a shallow clone of rust-lang/rust is 103M and a deep clone is 740M, so this almost halves the amount of history necessary if you made a shallow clone to start, and it's a significant reduction even if not.

Closes rust-lang#63978. r? `@Mark-Simulacrum`

…ulacrum

Assemble the compiler when running `x.py build`

Previously, there was no way to actually get binaries in
`build/$TARGET/stage1/bin` without building the standard library. This
makes it possible to build just the compiler. This can be useful when
the standard library isn't actually necessary for trying out your tests
(e.g. a bug that can be reproduced with only a `no_core` crate).

Closes rust-lang#73519.

…ark-Simulacrum

Add `riscv32imc-esp-espidf` to 1.56 changelog

…crum

Update the 1.56.0 release header for consistency