Auto merge of #132317 - workingjubilee:rollup-x21ncea, r=workingjubilee

Rollup of 12 pull requests

Successful merges:

 - #131375 (compiler: apply clippy::clone_on_ref_ptr for CI)
 - #131520 (Mark `str::is_char_boundary` and `str::split_at*` unstably `const`.)
 - #132119 (Hack out effects support for old solver)
 - #132194 (Collect item bounds for RPITITs from trait where clauses just like associated types)
 - #132216 (correct LLVMRustCreateThinLTOData arg types)
 - #132233 (Split `boxed.rs` into a few modules)
 - #132266 (riscv-soft-abi-with-float-features.rs: adapt for LLVM 20)
 - #132270 (clarified doc for `std::fs::OpenOptions.truncate()`)
 - #132284 (Remove my ping for rustdoc/clean/types.rs)
 - #132293 (Remove myself from mentions inside `tests/ui/check-cfg` directory)
 - #132312 (Delete `tests/crashes/23707.rs` because it's flaky)
 - #132313 (compiletest: Rename `command-list.rs` to `directive-list.rs`)

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

Author: bors