message: Use TrapCode::UnreachableCodeReached in trap_unreachable
diff: @@ -65,7 +65,7 @@ pub fn trap_unreachable(
  msg: impl AsRef<str>,
  ) {
  codegen_print(fx, msg.as_ref());
  - fx.bcx.ins().trap(TrapCode::User(!0));
  + fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
  }
  /// Use this when something is unimplemented, but `libcore` or `libstd` requires it to codegen.
  