[GHC] #7307: Share top-level code for strings

[GHC]

#7307: Share top-level code for strings
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        Reporter:  simonpj           |            Owner:  parcs
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  7.6.1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by ezyang):

 You may be right; static thunks might be blackholed anyway so the update
 can be done atomically. But I'd have to check: note the comment also
 states that static thunks have no payload; this is not true for TopUnpack.

 I am not sure if adjusting THUNK_STATIC to now take a payload will cause
 any problems. Probably it's best to check all cases in the RTS that handle
 this closure type and see if they have any assumptions about payload sie.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7307#comment:8>
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