Method start_pass

cranelift/codegen/src/timing.rs:263–271

(&self, pass: Pass)

    impl Profiler for DefaultProfiler {
        fn start_pass(&self, pass: Pass) -> Box<dyn Any> {
            let prev = CURRENT_PASS.with(|p| p.replace(pass));
            log::debug!("timing: Starting {pass}, (during {prev})");
            Box::new(DefaultTimingToken {
                start: monotonic_instant(),
                pass,
                prev,
            })
        }
    }

    /// A timing token is responsible for timing the currently running pass. Timing starts when it