Reflecting commit 15497 on version/4.02:
PR#6588 part 1: wrong "parallel move" code generated for CSE of operators
  that have multiple results.


git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15530 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02