The table rows were obtained via the script embedded in the page.

These lines (including the FIXME comment) were added to windows_gnu_base.rs in cf2c492 but windows_gnullvm_base.rs was not updated.  This resulted in an error `LLVM ERROR: dwo only supported with ELF and Wasm` attempting to build on aarch64-pc-windows-gnullvm.

Signed-off-by: Jeremy Drake <github@jdrake.com>

The helper shell script has been rewritten as a helper Python script
that generates the range-based table.

This also updates the existing iter::Copied::next_chunk benchmark so
that the thing it benches doesn't get masked by the ArrayChunks specialization

This is fairly safe use of TRA since it consumes the iterator so
no struct in an unsafe state will be left exposed to user code

The type is unsafe and now exposed to the whole crate.
Document it properly and add an unsafe method so the
caller can make it visible that something unsafe is happening.

…imulacrum

Specialize `iter::ArrayChunks::fold` for TrustedRandomAccess iterators

```
OLD:
test iter::bench_trusted_random_access_chunks                      ... bench:         368 ns/iter (+/- 4)
NEW:
test iter::bench_trusted_random_access_chunks                      ... bench:          30 ns/iter (+/- 0)
```

The resulting assembly is similar to rust-lang#103166 but the specialization kicks in under different (partially overlapping) conditions compared to that PR. They're complementary.

In principle a TRA-based specialization could be applied to all `ArrayChunks` methods, including `next()` as we do for `Zip` but that would have all the same hazards as the Zip specialization. Only doing it for `fold` is far less hazardous. The downside is that it only helps with internal, exhaustive iteration. I.e. `for _ in` or `try_fold` will not benefit.

Note that the regular, `try_fold`-based and the specialized `fold()` impl have observably slightly different behavior. Namely the specialized variant does not fetch the remainder elements from the underlying iterator. We do have a few other places in the standard library where beyond-the-end-of-iteration side-effects are being elided under some circumstances but not others.

Inspired by https://old.reddit.com/r/rust/comments/yaft60/zerocost_iterator_abstractionsnot_so_zerocost/

…apes, r=wesleywiser

Fix `rustc_parse_format` spans following escaped utf-8 multibyte chars

Currently too many skips are created for char escapes that are larger than 1 byte when encoded in UTF-8, [playground:](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=c77a9dc669b69b167271b59ed2c8d88c)

```rust
fn main() {
    format!("\u{df}{a}");
    format!("\u{211d}{a}");
    format!("\u{1f4a3}{a}");
}
```
```
error[[E0425]](https://doc.rust-lang.org/stable/error-index.html#E0425): cannot find value `a` in this scope
 --> src/main.rs:2:22
  |
2 |     format!("\u{df}{a}");
  |                      ^ not found in this scope

error[[E0425]](https://doc.rust-lang.org/stable/error-index.html#E0425): cannot find value `a` in this scope
 --> src/main.rs:3:25
  |
3 |     format!("\u{211d}{a}");
  |                         ^ not found in this scope

error[[E0425]](https://doc.rust-lang.org/stable/error-index.html#E0425): cannot find value `a` in this scope
 --> src/main.rs:4:27
  |
4 |     format!("\u{1f4a3}{a}");
  |                           ^ not found in this scope
```

This reduces the number of skips to account for that

Fixes rust-lang/rust-clippy#9727

…red-tracking, r=eholk

Move `fallback_has_occurred` state tracking to `FnCtxt`

Removes a ton of callsites that defaulted to `false`

Update linker-plugin-lto.md to contain up to Rust 1.65

The table rows were obtained via the script embedded in the page.

…=eholk

Remove `in_tail_expr` from FnCtxt

Cleans up yet another unneeded member from `FnCtxt`. The `in_tail_expr` condition wasn't even correct -- it was set for true while typechecking the whole fn body.

fix debuginfo for windows_gnullvm_base.rs

These lines (including the FIXME comment) were added to windows_gnu_base.rs in cf2c492 but windows_gnullvm_base.rs was not updated.  This resulted in an error `LLVM ERROR: dwo only supported with ELF and Wasm` attempting to build on aarch64-pc-windows-gnullvm.

See also msys2/MINGW-packages#13921 (comment)

/cc ```@mati865``` ```@davidtwco```

r? ```@davidtwco```

…eywiser

fully move `on_unimplemented` to `error_reporting`

the `traits` module has a few too many submodules in my opinion.