message: Add a note on incorrect code generation.
diff: @@ -286,7 +286,7 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext> for X64ModuleCode
  locals: vec![],
  num_params: 0,
  current_stack_offset: 0,
  - value_stack: ValueStack::new(4),
  + value_stack: ValueStack::new(4), // FIXME: Use of R8 and above registers generates incorrect assembly.
  control_stack: None,
  unreachable_depth: 0,
  };
  