fix tidy checks and correct cpu-usage-over-time-plot script

Co-authored-by: Josh Triplett <josh@joshtriplett.org>

Co-Authored-By: Joshua Nelson <github@jyn.dev>
Co-Authored-By: Eric Huss <eric@huss.org>

update CPU usage script

I've made slight changes to the CPU usage plot script with updated links from the [ci2 aws instance](https://rust-lang-ci2.s3.amazonaws.com/).

Use futex based thread parker on Fuchsia.

…mulacrum

Add release notes for 1.62

cc ``@rust-lang/release``

r? ``@pietroalbini``

clarify how Rust atomics correspond to C++ atomics

``@cbeuw`` noted in rust-lang/miri#1963 that the correspondence between C++ atomics and Rust atomics is not quite as obvious as one might think, since in Rust I can use `get_mut` to treat previously non-atomic data as atomic. However, I think using C++20 `atomic_ref`, we can establish a suitable relation between the two -- or do you see problems with that ``@cbeuw?`` (I recall you said there was some issue, but it was deep inside that PR and Github makes it impossible to find...)

Cc ``@thomcc;`` not sure whom else to ping for atomic memory model things.

… r=oli-obk

Point at return expression for RPIT-related error

Certainly this needs some diagnostic refining, but I wanted to show that it was possible first and foremost. Not sure if this is the right approach. Open to feedback.

Fixes rust-lang#80583

Simplify `likely!` and `unlikely!` macro

The corresponding intrinsics have long been safe-to-call, so the unsafe block is no longer needed.

…r=Mark-Simulacrum

Add some tests for impossible bounds

Adds test for rust-lang#93008
Adds test for rust-lang#94680
Closes rust-lang#94999
Closes rust-lang#95640

…huss

Document unstable `--extern` options

These are needed for Cargo's `build-std` feature and for anyone who wanted to do a similar thing outside of Cargo.

…acrum

Add missing period

…omcc

remove use of &Alloc in btree tests

I missed these in rust-lang#98233.

r? ``@thomcc``