[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:
            Type:  feature request     |           Status:  new
        Priority:  normal              |        Milestone:
       Component:  Compiler (CodeGen)  |          Version:  7.8.2
      Resolution:                      |         Keywords:
Operating System:  Unknown/Multiple    |     Architecture:
 Type of failure:  None/Unknown        |  Unknown/Multiple
       Test Case:                      |       Difficulty:  Unknown
        Blocking:                      |       Blocked By:
                                       |  Related Tickets:
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Comment (by ezyang):

 The comment dates back to GHC 4.01, so it might be wrong; I can't think of
 any reason for the GC to be doing any scribbling here (Chars and Ints are
 NOCAF, so we don't need to link them together on the static_objects list;
 ditto for all of the other similar miscellaneous closures.). Maybe Simon
 knows better.

 In any case, it will be a moot point when is #8199 fixed, after which
 "static closures" absolutely must be writable since we need to update them
 to indirect onto blocks we've allocated.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8996#comment:4>
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