Bug 1668514 - Update crossbeam-channel. r=janerik, a=jcristau

It's used by both webrender and fog, and it contains a subtle soundness
issue which may affect us, see:

 * crossbeam-rs/crossbeam#533
 * https://twitter.com/khuey_/status/1311641831201857537

Quoting for posterity:

> There is a 0.4.4 on a branch and it contains a reversion for the UB
> mentioned in crossbeam-rs/crossbeam#533.
>
> This was causing corruption of jemalloc structures (and ultimately a
> deadlock) for us.

Update the crate resolving the issue.

Differential Revision: https://phabricator.services.mozilla.com/D92046

third_party/rust/crossbeam-channel/.cargo-checksum.json

@@ -1 +1 @@
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third_party/rust/crossbeam-channel/CHANGELOG.md

@@ -1,3 +1,8 @@
+# Version 0.4.4
+
+- Fix bug in release (yanking 0.4.3)
+- Fix UB and breaking change introduced in 0.4.3
+
 # Version 0.4.3
 
 - Change license to "MIT OR Apache-2.0".

third_party/rust/crossbeam-channel/Cargo.toml

@@ -11,9 +11,8 @@
 # will likely look very different (and much more reasonable)
 
 [package]
-edition = "2018"
 name = "crossbeam-channel"
-version = "0.4.3"
+version = "0.4.4"
 authors = ["The Crossbeam Project Developers"]
 description = "Multi-producer multi-consumer channels for message passing"
 homepage = "https://github.com/crossbeam-rs/crossbeam/tree/master/crossbeam-channel"
@@ -23,22 +22,16 @@ keywords = ["channel", "mpmc", "select", "golang", "message"]
 categories = ["algorithms", "concurrency", "data-structures"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/crossbeam-rs/crossbeam"
-[dependencies.cfg-if]
-version = "0.1.10"
-
 [dependencies.crossbeam-utils]
 version = "0.7"
-optional = true
-default-features = false
+
+[dependencies.maybe-uninit]
+version = "2.0.0"
 [dev-dependencies.num_cpus]
-version = "1.13.0"
+version = "1.10.0"
 
 [dev-dependencies.rand]
-version = "0.7.3"
+version = "0.6"
 
 [dev-dependencies.signal-hook]
-version = "0.1.15"
-
-[features]
-default = ["std"]
-std = ["crossbeam-utils/std"]
+version = "0.1.5"

third_party/rust/crossbeam-channel/README.md

@@ -1,14 +1,14 @@
 # Crossbeam Channel
 
-[![Build Status](https://github.com/crossbeam-rs/crossbeam/workflows/CI/badge.svg)](
-https://github.com/crossbeam-rs/crossbeam/actions)
-[![License](https://img.shields.io/badge/license-MIT%20OR%20Apache--2.0-blue.svg)](
-https://github.com/crossbeam-rs/crossbeam/tree/master/crossbeam-channel#license)
+[![Build Status](https://travis-ci.org/crossbeam-rs/crossbeam.svg?branch=master)](
+https://travis-ci.org/crossbeam-rs/crossbeam)
+[![License](https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg)](
+https://github.com/crossbeam-rs/crossbeam-channel)
 [![Cargo](https://img.shields.io/crates/v/crossbeam-channel.svg)](
 https://crates.io/crates/crossbeam-channel)
 [![Documentation](https://docs.rs/crossbeam-channel/badge.svg)](
 https://docs.rs/crossbeam-channel)
-[![Rust 1.36+](https://img.shields.io/badge/rust-1.36+-lightgray.svg)](
+[![Rust 1.28+](https://img.shields.io/badge/rust-1.28+-lightgray.svg)](
 https://www.rust-lang.org)
 [![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.gg/BBYwKq)
 
@@ -44,11 +44,16 @@ Add this to your `Cargo.toml`:
 crossbeam-channel = "0.4"
 ```
 
+Next, add this to your crate:
+
+```rust
+#[macro_use]
+extern crate crossbeam_channel;
+```
+
 ## Compatibility
 
-Crossbeam Channel supports stable Rust releases going back at least six months,
-and every time the minimum supported Rust version is increased, a new minor
-version is released. Currently, the minimum supported Rust version is 1.36.
+The minimum supported Rust version is 1.28. Any change to this is considered a breaking change.
 
 ## License