Block scoped variables should be visible across scripts

[Paulius Varna]

Const and let should be scoped to global context if used in top level script. (warning, global context is not the same as global object).
Explanation: https://www.youtube.com/watch?v=5LEuJNLfLN0
Reproduction:

<script>
  var one = true;
  const two = true;
</script>

<script type="module">
  var three = true;
  const four = true;
</script>

<script type="module">
  console.log({ one });
  console.log({ two });
  console.log({ three }); // should throw
  console.log({ four }); // should throw
</script>

[Paulius Varna]

On Safari 12.1, 13 and 13.1 throws error at console.log({ two }). It shouldn't.

[Radar WebKit Bug Importer]

<rdar://problem/55563029>

[Yusuke Suzuki]

Fixed in bug 193347

*** This bug has been marked as a duplicate of bug 193347 ***