Headers WAY less than 1kb anyway, so this can be improved more?

before

==18725== Total:     429,769,246 bytes in 957,259 blocks
==18725== At t-gmax: 8,058,316 bytes in 3,502 blocks
==18725== At t-end:  3,045,261 bytes in 1,097 blocks
==18725== Reads:     431,872,599 bytes
==18725== Writes:    214,738,653 bytes

after

==49344== Total:     201,418,575 bytes in 957,174 blocks
==49344== At t-gmax: 7,937,250 bytes in 3,310 blocks
==49344== At t-end:  3,035,637 bytes in 1,076 blocks
==49344== Reads:     431,607,448 bytes
==49344== Writes:    210,731,540 bytes

keeping order of inserted Paths having high cost on hot path, collect into HashSet instead and sort afterward.

from 1,858,963,938 to 1,448,975,825 I refs.

…ayout, r=oli-obk

Warn on references casting to bigger memory layout

This PR extends the [`invalid_reference_casting`](https://doc.rust-lang.org/rustc/lints/listing/deny-by-default.html#invalid-reference-casting) lint (*deny-by-default*) which currently lint on `&T -> &mut T` casting to also lint on `&(mut) A -> &(mut) B` where `size_of::<B>() > size_of::<A>()` (bigger memory layout requirement).

The goal is to detect such cases:

```rust
let u8_ref: &u8 = &0u8;
let u64_ref: &u64 = unsafe { &*(u8_ref as *const u8 as *const u64) };
//~^ ERROR casting references to a bigger memory layout is undefined behavior

let mat3 = Mat3 { a: Vec3(0i32, 0, 0), b: Vec3(0, 0, 0), c: Vec3(0, 0, 0) };
let mat3 = unsafe { &*(&mat3 as *const _ as *const [[i64; 3]; 3]) };
//~^ ERROR casting references to a bigger memory layout is undefined behavior
```

This is added to help people who write unsafe code, especially when people have matrix struct that they cast to simple array of arrays.

EDIT: One caveat, due to the [`&Header`](rust-lang/unsafe-code-guidelines#256) uncertainty the lint only fires when it can find the underline allocation.

~~I have manually tested all the new expressions that warn against Miri, and they all report immediate UB.~~

r? ``@est31``

…crum

Gate PR CI on clippy correctness lints

Implements part of rust-lang/compiler-team#709.

Note that `x.py clippy compiler` also checks the standard library, because it needs to be checked before the compiler. This happens even with `x.py clippy --stage 0`.

compiletest: few naive improvements

Tested on `python x.py --stage=1 t tests/ui/borrowck/ --force-rerun`, see individual commits.

Wall time didn't improved :-) .

…, r=RalfJung,oli-obk

Fix async closures in CTFE

First commit renames `is_coroutine_or_closure` into `is_closure_like`, because `is_coroutine_or_closure_or_coroutine_closure` seems confusing and long.

Second commit fixes some forgotten cases where we want to handle `TyKind::CoroutineClosure` the same as closures and coroutines.

The test exercises the change to `ValidityVisitor::aggregate_field_path_elem` which is the source of rust-lang#120946, but not the change to `UsedParamsNeedSubstVisitor`, though I feel like it's not that big of a deal. Let me know if you'd like for me to look into constructing a test for the latter, though I have no idea what it'd look like (we can't assert against `TooGeneric` anywhere?).

Fixes rust-lang#120946

r? oli-obk cc ``@RalfJung``

Dejargonize `subst`

In favor of rust-lang#110793, replace almost every occurence of `subst` and `substitution` from rustc codes, but they still remains in subtrees under `src/tools/` like clippy and test codes (I'd like to replace them after this)

Add lahfsahf and prfchw target feature

This adds target features for LAHF/SAHF and PrefetchW. These came up. along with the existing CMPXCHG16b. as [baseline features](https://download.microsoft.com/download/c/1/5/c150e1ca-4a55-4a7e-94c5-bfc8c2e785c5/Windows%2010%20Minimum%20Hardware%20Requirements.pdf) required for x86_64 Windows 10+.

…li-obk

add another test for promoteds-in-static

rust-lang#119614 led to validation of promoteds recursing into statics. These statics can point to `static mut` and interior mutable `static` and do other things we don't allow in `const`, but promoteds are validated as `const`, so we get strange errors (saying "in `const`" when there is no const) and surprising validation failures.

rust-lang#120960 fixes that; this here adds another test.

r? ``@oli-obk``
Fixes rust-lang#120968

Update books

## rust-lang/edition-guide

1 commits in baafacc6d8701269dab1e1e333f3547fb54b5a59..76bd48a273a0e0413a3bf22c699112d41497b99e
2024-02-10 20:50:34 UTC to 2024-02-10 20:50:34 UTC

- Set up scaffolding for 2024 (rust-lang/edition-guide#288)

## rust-lang/reference

4 commits in a0b119535e7740f68494c4f0582f7ad008b00ccd..8227666de13f6e7bb32dea9dc42e841adb5ce4b7
2024-02-12 03:04:15 UTC to 2024-01-30 20:10:53 UTC

- Fix a typo in external-blocks.md (rust-lang/reference#1467)
- Fix syntax in `'static lifetime elision` section of `lifetime-elision.md` (rust-lang/reference#1463)
- Fix markdown backslash for FLOAT_LITERAL (rust-lang/reference#1464)
- C string literal expressions (rust-lang/reference#1457)

## rust-lang/rust-by-example

5 commits in 179256a445d6144f5f371fdefb993f48f33978b0..e188d5d466f7f3ff9f1d518393235f4fe951be46
2024-02-07 17:16:00 UTC to 2024-01-31 17:34:10 UTC

- Update macros.md (rust-lang/rust-by-example#1815)
- Update borrow.md (rust-lang/rust-by-example#1814)
- Fixes the bug: rust-lang/rust-by-example#1721 (rust-lang/rust-by-example#1811)
- std_misc/process/pipe.md: Fix typo in pangram string (rust-lang/rust-by-example#1809)
- Add expected error behavior into docs (rust-lang/rust-by-example#1810)

## rust-lang/rustc-dev-guide

9 commits in ec287e3..1f30cc7
2024-02-11 05:36:15 UTC to 2024-01-29 19:49:51 UTC

- fix sentence (rust-lang/rustc-dev-guide#1882)
- Some updates for recent diagnostics changes. (rust-lang/rustc-dev-guide#1883)
- Rename occurrences of 'delay_span_bug' to 'span_delayed_bug' (rust-lang/rustc-dev-guide#1881)
- Update for upcoming markdown changes. (rust-lang/rustc-dev-guide#1880)
- Update uses of renamed BoxMeUp to PanicPayload (rust-lang/rustc-dev-guide#1878)
- Add links for arena and interning. (rust-lang/rustc-dev-guide#1868)
- Improving macro expansion section (rust-lang/rustc-dev-guide#1875)
- Replace letters by foo, bar and buz in lexing example (rust-lang/rustc-dev-guide#1870)
- Fix some broken links (rust-lang/rustc-dev-guide#1877)