Split TypeVisitable from TypeFoldable

Impl of rust-lang/compiler-team#520 following MCP approval.

r? `@ghost`

Rollup of 6 pull requests

Successful merges:

 - #95503 (bootstrap: Allow building individual crates)
 - #96814 (Fix repr(align) enum handling)
 - #98256 (Fix whitespace handling after where clause)
 - #98880 (Proper macOS libLLVM symlink when cross compiling)
 - #98944 (Edit `rustc_mir_dataflow::framework::lattice::FlatSet` docs)
 - #98951 (Update books)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Update books

## nomicon

2 commits in 3a43983b76174342b7dbd3e12ea2c49f762e52be..70db9e4189f64d1d8e2451b1046111fb356b6dc2
2022-05-30 17:01:30 +0900 to 2022-06-27 20:47:21 +0900
- should be `size_of` instead of `align_of` (rust-lang/nomicon#371)
- Fix wording on the aliasing section (rust-lang/nomicon#366)

## book

20 commits in efbafdba3618487fbc9305318fcab9775132ac15..cf2653a5ca553cbbb4a17f1a7db1947820f6a775
2022-06-19 21:06:50 -0400 to 2022-07-05 12:07:58 -0400
- Frontmatter
- Update to Rust 1.62
- Extract where clause example so it'll get rustfmtted in the future
- Merge remote-tracking branch 'origin/pr/3238' into extract-where-clause-example
- Fix line wrapping of lib placement fix
- Fix grammar, spelling, and line wrapping of description of appendices
- Merge remote-tracking branch 'origin/pr/3244' into binlib
- Clarify *type* parameter names
- Fix listing 8-21. Fixes rust-lang/book#3251
- Propagate tech review changes for ch13
- Responses to tech review of chapter 13
- Tech review comments on chapter 13
- Fix double the
- Propagate tech review chapter 1 changes to src
- Address tech review comments for chapter 1
- Tech review comments for chapter 1
- Fix grammar
- Fix grammar
- Edits to edits to the introduction
- Comments from nostarch on the introduction

## rust-by-example

8 commits in 1095df2a5850f2d345fad43a30633133365875ba..83724ca387a2a1cd3e8d848f62820020760e358b
2022-06-18 21:47:12 -0300 to 2022-07-05 10:38:07 -0300
- changing names of params (rust-lang/rust-by-example#1567)
- Update incorrect print output in std/box.md (rust-lang/rust-by-example#1564)
- minor typo (rust-lang/rust-by-example#1563)
- fix: Fibonacci sequence starts from zero (rust-lang/rust-by-example#1562)
- add Vietnamese version on README.md (rust-lang/rust-by-example#1561)
- Update variadics.md (rust-lang/rust-by-example#1559)
- Change fold to sum in fn hof.md (rust-lang/rust-by-example#1560)
- Small typo, fixed compileable -> compilable (rust-lang/rust-by-example#1556)

## rustc-dev-guide

8 commits in 048d925f0a955aac601c4160c0e7f05771bcf63b..eb83839e903a0a8f1406f7e941886273f189b26b
2022-06-21 22:25:34 +0900 to 2022-07-03 15:17:39 +0900
- Suggest a separate build directory for rust-analyzer (rust-lang/rustc-dev-guide#1378)
- Change the old filename, "src/stage0.txt" to "src/stage0.json" (rust-lang/rustc-dev-guide#1383)
- Add the config needed to get rust-analyzer working on src/bootstrap (rust-lang/rustc-dev-guide#1381)
- Fix path to hir_id_validator.rs
- leave formatOnSave to the user (rust-lang/rustc-dev-guide#1380)
- diagnostics: structs with new slug syntax (rust-lang/rustc-dev-guide#1377)
- Few readability fixes
- humorust: Forbid pineapple on pizza (rust-lang/rustc-dev-guide#1374)

## embedded-book

1 commits in e17dcef5e96346ee3d7fa56820ddc7e5c39636bc..766979590da8100998f0d662499d4a901d8d1640
2022-06-19 10:28:00 +0000 to 2022-07-04 09:13:58 +0000
- "linker `link.exe` not found" fix  (rust-embedded/book#321)

Edit `rustc_mir_dataflow::framework::lattice::FlatSet` docs

Cosmetic improvements. Adds a paragraph break, and
ellipses to signify arbitrary size of a flat set.

Proper macOS libLLVM symlink when cross compiling

Follow up of #98418

When cross compiling on macOS with `llvm.link-shared` enabled, the symlink creation will fail after compiling LLVM for the target architecture, because it will attempt to create the symlink in the host LLVM directory, which was already created when being built.

This commit changes the symlink path to the actual LLVM output.

r? `@jyn514`

Fix whitespace handling after where clause

Fixes #97733.

You can see the result [here](https://rustdoc.crud.net/imperio/whitespace-where-clause/doc/foo/index.html).

r? `@jsha`

Fix repr(align) enum handling

`enum`, for better or worse, supports `repr(align)`. That has already caused a bug in https://github.com/rust-lang/rust/issues/92464, which was "fixed" in https://github.com/rust-lang/rust/pull/92932, but it turns out that that fix is wrong and caused https://github.com/rust-lang/rust/issues/96185.

So this reverts #92932 (which fixes #96185), and attempts another strategy for fixing #92464: special-case enums when doing a cast, re-using the code to load the discriminant rather than assuming that the enum has scalar layout. This works fine for the interpreter.

However, #92464 contained another testcase that was previously not in the test suite -- and after adding it, it ICEs again. This is not surprising; codegen needs the same patch that I did in the interpreter. Probably this has to happen [around here](https://github.com/rust-lang/rust/blob/d32ce37a171663048a4c4a536803434e40f52bd6/compiler/rustc_codegen_ssa/src/mir/rvalue.rs#L276). Unfortunately I don't know how to do that -- the interpreter can load a discriminant from an operand, but codegen can only do that from a place. `@oli-obk` `@EddyB` `@bjorn3` any idea?

bootstrap: Allow building individual crates

This aims to be as unintrusive as possible, but did still require adding a new `tail_args` field to all `Rustc` and `Std` steps.

New library and compiler crates are added to the sysroot as they are built, since it's useful to have e.g. just alloc and not std.

Fixes https://github.com/rust-lang/rust/issues/44293.

Update cargo

9 commits in dbff32b27893b899ae2397f3d56d1be111041d56..c0bbd42ce5e83fe2a93e817c3f9b955492d3130a
2022-06-24 19:25:13 +0000 to 2022-07-03 13:41:11 +0000
- fix typo (rust-lang/cargo#10818)
- fix(add): Don't panic with `--offline` (rust-lang/cargo#10817)
- chore: Set permissions for GitHub actions (rust-lang/cargo#10816)
- Bump to 0.65.0, update changelog (rust-lang/cargo#10812)
- Fix zsh completions for add and locate-project (rust-lang/cargo#10810)
- Bump cargo-util version. (rust-lang/cargo#10804)
- Update os_info (rust-lang/cargo#10802)
- Fix deserialization of check-cfg in config.toml (rust-lang/cargo#10799)
- fix: bash complete `install --path` with dirs (rust-lang/cargo#10798)

Rollup of 6 pull requests

Successful merges:

 - #98860 (adjust dangling-int-ptr error message)
 - #98888 (interpret: fix CheckedBinOp behavior when overflow checking is disabled)
 - #98889 (Add regression test for #79467)
 - #98895 (bootstrap.py: Always use `.exe` for Windows)
 - #98920 (adapt issue-37945 codegen test to accept any order of ops)
 - #98921 (Refactor: remove a redundant mutable variable)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Cosmetic improvements. Adds a paragraph break, and
ellipses to signify arbitrary size of a flat set.

Refactor: remove a redundant mutable variable

adapt issue-37945 codegen test to accept any order of ops

Adapt this test to accept `icmp` operands in any order as a follow-up to https://github.com/rust-lang/rust/commit/cbbf06b0cd39dc93033568f1e65f5363cbbdebcd#commitcomment-77670922.

bootstrap.py: Always use `.exe` for Windows

This ensures that it will run the Windows executable if other files in the directory (such as Linux executables) have the same file name minus the extension. I've been tripped up by this a few times where both `bootstrap` and `bootstrap.exe` end up in the same directory.

This PR avoids ever having to see the following message:

`OSError: [WinError 193] %1 is not a valid Win32 application`

Add regression test for #79467

closes #79467

interpret: fix CheckedBinOp behavior when overflow checking is disabled

Adjusts the interpreter to https://github.com/rust-lang/rust/pull/98738.

r? `@oli-obk`

adjust dangling-int-ptr error message

based on suggestions by `@saethlin` in https://github.com/rust-lang/miri/issues/2163

Fixes https://github.com/rust-lang/miri/issues/2163

I also did a bit of refactoring on this, so we have a helper method to create a `Pointer` with `None` provenance.

continue nll transition by removing stuff

r? `@jackh726` for now

building on #98641

Rollup of 5 pull requests

Successful merges:

 - #97712 (ptr::copy and ptr::swap are doing untyped copies)
 - #98624 (lints: mostly translatable diagnostics)
 - #98776 (rustdoc: improve click behavior of the source code mobile full-screen "sidebar")
 - #98856 (Remove FIXME from rustdoc intra-doc test)
 - #98913 (⬆ rust-analyzer)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

⬆ rust-analyzer

r? ``@ghost``

Remove FIXME from rustdoc intra-doc test

Removed the FIXME.

For the `extern crate`, even if `pub` exported, its documentation wasn't rendered so there is no point in keeping it.

r? ``@notriddle``

rustdoc: improve click behavior of the source code mobile full-screen "sidebar"

On desktop, if you open the source code sidebar, it stays open even when you move from page to page. It used to do the same thing on mobile, but I think that's stupid. Since the file list fills the entire screen on mobile, and you can't really do anything with the currently selected file other than dismiss the "sidebar" to look at it, it's safe to assume that anybody who clicks a file in that list probably wants the list to go away so they can see it.

Split out separately from #98772

lints: mostly translatable diagnostics

As lints are created slightly differently than other diagnostics, intended to try make them translatable first and then look into the applicability of diagnostic structs but ended up just making most of the diagnostics in the crate translatable (which will still be useful if I do make a lot of them structs later anyway).

r? ``@compiler-errors``

ptr::copy and ptr::swap are doing untyped copies

The consensus in https://github.com/rust-lang/rust/issues/63159 seemed to be that these operations should be "untyped", i.e., they should treat the data as raw bytes, should work when these bytes violate the validity invariant of `T`, and should exactly preserve the initialization state of the bytes that are being copied. This is already somewhat implied by the description of "copying/swapping size*N bytes" (rather than "N instances of `T`").

The implementations mostly already work that way (well, for LLVM's intrinsics the documentation is not precise enough to say what exactly happens to poison, but if this ever gets clarified to something that would *not* perfectly preserve poison, then I strongly assume there will be some way to make a copy that *does* perfectly preserve poison). However, I had to adjust `swap_nonoverlapping`; after ``@scottmcm's`` [recent changes](https://github.com/rust-lang/rust/pull/94212), that one (sometimes) made a typed copy. (Note that `mem::swap`, which works on mutable references, is unchanged. It is documented as "swapping the values at two mutable locations", which to me strongly indicates that it is indeed typed. It is also safe and can rely on `&mut T` pointing to a valid `T` as part of its safety invariant.)

On top of adding a test (that will be run by Miri), this PR then also adjusts the documentation to indeed stably promise the untyped semantics. I assume this means the PR has to go through t-libs (and maybe t-lang?) FCP.

Fixes https://github.com/rust-lang/rust/issues/63159