Fixes to rubbish literals

* In CoreToStg, the application 'RUBBISH[rep] x' was simplified
  to 'RUBBISH[rep]'. But it is possible that the result of the function
  is represented differently than the function.
* In Unarise, 'LitRubbish (primRepToType prep)'
  is incorrect: LitRubbish takes a RuntimeRep such as IntRep,
  while primRepToType returns a type such as Any @(TYPE IntRep). Use
  primRepToRuntimeRep instead.
  This code is never run in the testsuite.
* In StgToByteCode, all rubbish literals were assumed to be boxed.
  This code predates representation-polymorphic RubbishLit and I think
  it was not updated.

I don't have a testcase for any of those issues, but the code looks
wrong.

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