message: Change the ice hook for cg_clif to refer to cg_clif's issue tracker
diff: -#![feature(rustc_private)]
  +#![feature(rustc_private, once_cell)]
  extern crate rustc_data_structures;
  extern crate rustc_driver;
  extern crate rustc_session;
  extern crate rustc_target;
  +use std::panic;
  +use std::lazy::SyncLazy;
  +
  use rustc_data_structures::profiling::{get_resident_set_size, print_time_passes_entry};
  use rustc_interface::interface;
  use rustc_session::config::ErrorOutputType;
  use rustc_session::early_error;
  use rustc_target::spec::PanicStrategy;
  +const BUG_REPORT_URL: &str = "https://github.com/bjorn3/rustc_codegen_cranelift/issues/new";
  +
  +static DEFAULT_HOOK: SyncLazy<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send + 'static>> =
  + SyncLazy::new(|| {
  + let hook = panic::take_hook();
  + panic::set_hook(Box::new(|info| {
  + // Invoke the default handler, which prints the actual panic message and optionally a backtrace
  + (*DEFAULT_HOOK)(info);
  +
  + // Separate the output with an empty line
  + eprintln!();
  +
  + // Print the ICE message
  + rustc_driver::report_ice(info, BUG_REPORT_URL);
  + }));
  + hook
  + });
  +
  #[derive(Default)]
  pub struct CraneliftPassesCallbacks {
  time_passes: bool,
  @@ -37,7 +58,7 @@ fn main() {
  let start_rss = get_resident_set_size();
  rustc_driver::init_rustc_env_logger();
  let mut callbacks = CraneliftPassesCallbacks::default();
  - rustc_driver::install_ice_hook();
  + SyncLazy::force(&DEFAULT_HOOK); // Install ice hook
  let exit_code = rustc_driver::catch_with_exit_code(|| {
  let args = std::env::args_os()
  .enumerate()
  