[GHC] #8199: Get rid of HEAP_ALLOCED

[GHC]

#8199: Get rid of HEAP_ALLOCED
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        Reporter:  ezyang            |                   Owner:  ezyang
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.7
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:  5435              |                Blocking:
 Related Tickets:                    |  Differential Revisions:  D207
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Comment (by simonmar):

 I wonder whether we might try an alternative strategy on Windows: a bitmap
 covering the whole 48-bit address space (units of 1MB) is only 32MB, and
 most of it won't be touched in the common case.  The remaining question is
 whether checking this bitmap can be made as cheap as the current cache.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8199#comment:50>
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