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Rollup of 3 pull requests - #151598

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JonathanBrouwer wants to merge 9 commits into

rust-lang:mainfrom

JonathanBrouwer:rollup-RSdwbHy

Commits on Jan 19, 2026
- add `simd_splat` intrinsic
  folkertdev
  committed
  80c0b99
- `simd_splat`: custom error in gcc backend for invalid element type
  folkertdev
  committed
  120388c
- rustc-dev-guide: Mention `--extern` modifiers for `aux-crate` directive
  Enselic
  committed
  9aaa581
Commits on Jan 24, 2026