message: Mark extern rust-cold calls as cold
diff: @@ -376,9 +376,15 @@ pub(crate) fn codegen_terminator_call<'tcx>(
  RevealAllLayoutCx(fx.tcx).fn_abi_of_fn_ptr(fn_ty.fn_sig(fx.tcx), extra_args)
  };
  - let is_cold = instance
  - .map(|inst| fx.tcx.codegen_fn_attrs(inst.def_id()).flags.contains(CodegenFnAttrFlags::COLD))
  - .unwrap_or(false);
  + let is_cold = if fn_sig.abi == Abi::RustCold {
  + true
  + } else {
  + instance
  + .map(|inst| {
  + fx.tcx.codegen_fn_attrs(inst.def_id()).flags.contains(CodegenFnAttrFlags::COLD)
  + })
  + .unwrap_or(false)
  + };
  if is_cold {
  fx.bcx.set_cold_block(fx.bcx.current_block().unwrap());
  if let Some(destination_block) = target {
  