Rust 1.95 stabilized [`std::hint::cold_path`](https://doc.rust-lang.org/std/hint/fn.cold_path.html), re-exported via `oxc_data_structures::branch_hints` in #24368. This replaces the `cold_branch` closure trampoline with `cold_path()` at the **14 call sites where the hint only guides branch layout** — straight-line code instead of closure ceremony.

The other **10 sites keep `cold_branch` deliberately**: they build diagnostics, and several document (e.g. `cursor.rs` `asi()`, `punctuation.rs` `<!--`, `string.rs`, `numeric.rs`) that the `#[cold]` trampoline exists to keep the ~232-byte `OxcDiagnostic` return buffer out of the hot function's stack frame. `cold_path` only sets branch weights — it does not outline code or stack usage — so replacing those sites would regress that. `cold_branch`'s doc comment now explains when to use which.

One small unlock while here: the comment in `skip_multi_line_comment` saying we "can't use `return` in a closure" to jump to the faster post-line-break search — that limitation is gone now the closure is gone; left as a possible follow-up since it's a behavior change.

Verified:
- `cargo test -p oxc_parser` and clippy clean.
- Parser conformance (test262 / babel / typescript / misc): **zero snapshot diffs**.
- Codegen-wise the replaced sites were tiny closures that inlined into the trampoline anyway; CodSpeed on this PR is the final perf gate.

🤖 Generated with [Claude Code](https://claude.com/claude-code)