[GHC] #12437: 20% regression in max_bytes_used for T1969

[GHC]

#12437: 20% regression in max_bytes_used for T1969
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        Reporter:  simonmar          |                Owner:  osa1
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 Regression is due to my patch, but I'm not sure what the solution is here.
 Do you want me to bump the threshold, because with the patch allocation is
 actually reduced?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12437#comment:7>
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