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

[GHC]

#11020: Make worker-wrapper transformation optional.
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        Reporter:  darchon           |                Owner:  darchon
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1372
       Wiki Page:                    |
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"31704adc82c3a1e48ac05c51f02933fd996b642a/ghc" 31704ad/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="31704adc82c3a1e48ac05c51f02933fd996b642a"
 Make worker-wrapper optional

 Add -fworker-wrapper flag which enables the worker-wrapper transformation.
 It
 is implied by -O.

 The expected users of this flag, which includes myself, are GHC API users.
 In
 my Haskell-to-Hardware compiler, 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

 Reviewed By: austin

 Differential Revision: https://phabricator.haskell.org/D1372

 GHC Trac Issues: #11020
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11020#comment:3>
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