[GHC] #10613: Mechanism for checking that we only enter single-entry thunks once

[GHC]

#10613: Mechanism for checking that we only enter single-entry thunks once
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        Reporter:  bgamari           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Oh ok, well, same deal.  When you enter a (dynamically allocated) function
 there's a register pointing to the function closure.  So the ticky code at
 the start of the function's code can bump the  count in `ClosurePtr[4]`
 (or whatever the appropriate offset is.  No?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10613#comment:18>
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