[GHC] #8996: mark more things as const in C codegen

[GHC]

#8996: mark more things as const in C codegen
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        Reporter:  slyfox            |                Owner:  (none)
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  7.8.2
  (CodeGen)                          |
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3481
       Wiki Page:                    |
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Comment (by bgamari):

 trofi, feel free to reopen if you know of anything else that hasn't yet
 been marked as const.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8996#comment:9>
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