Added failing test case for the `yield` precedence

I've added a test case for the `yield` precedence. Discussed in https://github.com/jashkenas/coffeescript/issues/3674

```coffeescript
 test "symbolic operators has precedence over the `yield`", ->

  symbolic   = '+ - * / << >> & | || && ** ^ \\ or and'.split ' '
  compound   = ("#{op}=" for op in symbolic)
  relations  = '< > == != <= >= is isnt'.split ' '

  operators  = []
  operators.push symbolic...
  operators.push compound...
  operators.push relations...

  allOf = (gen) -> ref.value until (ref = gen.next()).done

  values = [0, 1, 2, 3]

  for op in operators
    generator = CoffeeScript.eval "(arr) -> yield i #{op} 2 for i in arr"
    transform = CoffeeScript.eval "(i) -> i #{op} 2"
    expected = values.map transform
    actual = allOf generator values
    arrayEq actual, expected
```
Oh! Did not know about that syntax, thanks!
I'll change it.