[GHC] #12620: Allow the user to prevent floating and CSE

[GHC]

#12620: Allow the user to prevent floating and CSE
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        Reporter:  nomeata           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 That all looks possible.  Since `nofloat` does several things, it may not
 be long before people start asking for variants that do some combination
 of its properties. But I guess we can jump that bridge if we come to it.

 It would be useful to give some compelling use-cases.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12620#comment:4>
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