swift234

fix the last (known to me) sin being committed by the REPL logic.  Previously
for a repl declaration like:

  var (a,b) = (1,2)

We compiled the AST into a DAG that effectively looked like:
  var (a,b) = (1,2)
  print(subexpression of the PBD)

This is shameful.  We now produce:

  var r123 = (1,2)
  var (a,b) = r123
  print(r123)

which is correct.



Swift SVN r4624