js: can't take addr of param (including implicitly via lent)

[timotheecour]

js: can't take addr of param

Example

when true:
  proc bar[T](a: T): lent T = a
  let a = 10
  echo bar(a)

Current Output

Error: internal error: genAddr: 2

Expected Output

works

Additional Information

• split out from js: lent doesn't work in iterators with tuple destructuring #14574; turns out it's a different bug and I may have a fix for this one
• 0824fdd 1.3.5