Rollup of 6 pull requests
Successful merges:
- #69201 (Permit attributes on 'if' expressions)
- #69685 (unix: Don't override existing SIGSEGV/BUS handlers)
- #69762 (Ensure that validity only raises validity errors)
- #69779 (librustc_codegen_llvm: Use slices in preference to 0-terminated strings)
- #69801 (rustc_parse: Remove `Parser::normalized(_prev)_token`)
- #69842 (Add more regression tests)
Failed merges:
r? @ghost