[GHC] #13586: ghc --make seems to leak memory

[GHC]

#13586: ghc --make seems to leak memory
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        Reporter:  MikolajKonarski   |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13379            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 GHC certainly retains information about modules it has finished compiling
 in `--make` mode, by design--the information it wrote to the interface
 file, and would read back from the interface file if needed. It has
 "always" worked this way, though of course it's possible that the space
 usage of this retained data has increased, or that there is other data
 being retained unintentionally.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13586#comment:4>
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