See rust-lang#45041 for the removal of the
target (le32-unknown-nacl).

 - `target_os=watchos`: no longer relevant because there are now proper
   targets `*-apple-watchos`
 - `target_arch=nvptx64`: `nvptx64-nvidia-cuda`
 - `target_arch=le32`: target was removed
   (rust-lang#45041)
 - `dont_compile_me`: was removed from stdarch
   (rust-lang/stdarch#1308)

Also made some external cfg exception mode clear and only activated for
rustc and rustc tools (as to not have the Standard Library
unintentionally depend on them).

Include sanitizers supported by LLVM on s390x (asan, lsan, msan, tsan)
in the target definition, as well as in the compiletest supported list.

Build sanitizer runtime for the target.  Enable sanitizers in the CI.

Not all uses are converted, a few cases iterating through maps/sets and requiring nontrivial changes are kept.

…acrum

ci: add runners for vanilla LLVM 14 and 15

As discussed in [zulip #t-infra][1] -- r? Mark-Simulacrum

[1]: https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/testing.20multiple.20llvm.20versions

…k-cfgs, r=Mark-Simulacrum

bootstrap: cleanup the list of extra check cfgs

This PR performs some cleanups on the `EXTRA_CHECK_CFGS` list in bootstrap.

- `target_os=watchos`: no longer relevant because there are now proper targets `*-apple-watchos`
 - `target_arch=nvptx64`: target `nvptx64-nvidia-cuda` makes it useless
 - `target_arch=le32`: target was removed (rust-lang#45041)
 - ~~`release`: was removed from rustfmt (rust-lang/rustfmt#5375 and rust-lang/rustfmt#5449 (despite the changes being done more than 6 months ago there hasn't been any rustfmt subtree sync)
 - `dont_compile_me`: was removed from stdarch (rust-lang/stdarch#1308)

Also made some external cfg exception mode clear and only activated for rustc and rustc tools (as to not have the Standard Library unintentionally depend on them).

…didats-4, r=lcnr

Implement some more predicates in the new solver

Implement a few more goals. The subtype goal specifically is important, since it's required for this code to compile:

```
fn main() {
  let mut x = vec![];
  x.push(1i32);
}
```

(I think we emit a subtype goal here because of coercion).

Drive-by: Also implements `--compare-mode=next-solver` -- I've been using this locally a lot to find out what works and what doesn't. I'm also happy to split this out into another PR.

r? ``@lcnr``

…imulacrum

Enable sanitizers for s390x-linux

Include sanitizers supported by LLVM on s390x (asan, lsan, msan, tsan) in the target definition, as well as in the compiletest supported list.

Build sanitizer runtime for the target.  Enable sanitizers in the CI.

… r=notriddle

Migrate scraped-examples top and bottom "borders" to CSS variables

r? ``@notriddle``

…ompiler-errors

Add myself to .mailmap

rustdoc: Use `DefId(Map,Set)` instead of `FxHash(Map,Set)`

Not all uses are converted, a few cases iterating through maps/sets and requiring nontrivial changes are kept.
cc rust-lang#106977