[GHC] #11020: Make worker-wrapper transformation optional.

[GHC]

#11020: Make worker-wrapper transformation optional.
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           Reporter:  darchon        |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.11
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I would like the worker-wrapper transformation to be optional, so I can
 disable it in my very specific use case. I propose to add a {{{-fworker-
 wrapper}}} flag, which enables the worker-wrapper transformation, and is
 implied by {{{-O}}}

 The expected users of this flag, which includes myself, are GHC API users.
 In my Haskell-to-Hardware compiler [1], which uses the GHC API, I have
 seen no benifits of the worker-wrapper transformation. It does however
 induce longer compilation times.

 Further discussion can be seen here: https://mail.haskell.org/pipermail
 /ghc-devs/2015-October/010096.html

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11020>
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