Rollup of 5 pull requests

[GuillaumeGomez]

Successful merges:

• Lower AST node id only once #130259 (Lower AST node id only once)
• stable_mir: Directly use types from rustc_abi #132247 (stable_mir: Directly use types from rustc_abi)
• [rustdoc] Unify variant struct fields margins with struct fields #132258 ([rustdoc] Unify variant struct fields margins with struct fields)
• cg_llvm: Use a type-safe helper to cast &str and &[u8] to *const c_char #132260 (cg_llvm: Use a type-safe helper to cast &str and &[u8] to *const c_char)
• refactor: cleaner check to return None #132261 (refactor: cleaner check to return None)

r? @ghost
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