Auto merge of #148420 - Zalathar:rollup-1rrbzk7, r=Zalathar

Rollup of 5 pull requests

Successful merges:

 - rust-lang/rust#144194 (Provide additional context to errors involving const traits)
 - rust-lang/rust#148232 (ci: add runners for vanilla LLVM 21)
 - rust-lang/rust#148240 (rustc_codegen: fix musttail returns for cast/indirect ABIs)
 - rust-lang/rust#148247 (Remove a special case and move another one out of reachable_non_generics)
 - rust-lang/rust#148370 (Point at inner item when it uses generic type param from outer item or `Self`)

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

Author: bors