[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 believe lazy committing should be the default if you just allocate a
 chunk of memory with `VirtualAlloc`.  The pages will be lazily faulted in
 as necessary, so the pages we never touch won't consume any memory.  We
 just need to use the convention that a zero bit means "not heap".

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8199#comment:53>
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