new move analyser2 (#20471)

* produce better code for closure environment creation
* new 'first write' analysis; 
* scope based move analyser
* code cleanup

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>

lib/pure/collections/sequtils.nim

@@ -302,8 +302,7 @@ proc unzip*[S, T](s: openArray[(S, T)]): (seq[S], seq[T]) {.since: (1, 1).} =
       unzipped2 = @['a', 'b', 'c']
     assert zipped.unzip() == (unzipped1, unzipped2)
     assert zip(unzipped1, unzipped2).unzip() == (unzipped1, unzipped2)
-  result[0] = newSeq[S](s.len)
-  result[1] = newSeq[T](s.len)
+  result = (newSeq[S](s.len), newSeq[T](s.len))
   for i in 0..<s.len:
     result[0][i] = s[i][0]
     result[1][i] = s[i][1]