Auto merge of rust-lang#147261 - matthiaskrgr:rollup-yh3fgvc, r=matthiaskrgr

Rollup of 9 pull requests

Successful merges:

 - rust-lang#146281 (Support `#[rustc_align_static]` inside `thread_local!`)
 - rust-lang#146535 (mbe: Implement `unsafe` attribute rules)
 - rust-lang#146585 (indexing: reword help)
 - rust-lang#147004 (Tweak handling of "struct like start" where a struct isn't supported)
 - rust-lang#147221 (Forbid `//@ compile-flags: -Cincremental=` in tests)
 - rust-lang#147225 (Don't enable shared memory by default with Wasm atomics)
 - rust-lang#147227 (implement `Box::take`)
 - rust-lang#147233 (Initialize llvm submodule if not already the case to run citool)
 - rust-lang#147236 (Update books)

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

Author: bors