[GHC] #10706: Make -fcpr-off a dynamic flag

[GHC]

#10706: Make -fcpr-off a dynamic flag
-------------------------------------+-------------------------------------
        Reporter:  darchon           |                   Owner:  darchon
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       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 Revisions:  Phab:D1110
-------------------------------------+-------------------------------------

Comment (by simonpj):

 But how can you tell that the troublesome `case` appears?  Ah -- perhaps
 the missing piece is that you are using GHC as a library and consuming the
 optimised Core code that it produces?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10706#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler