[GHC] #10247: 5x increase in total memory allocation for `prof-doc-fib` test since 2011

[GHC]

#10247: 5x increase in total memory allocation for `prof-doc-fib` test since 2011
-------------------------------------+-------------------------------------
              Reporter:  thomie      |             Owner:
                  Type:  task        |            Status:  new
              Priority:  high        |         Milestone:
             Component:  Profiling   |           Version:  7.10.1
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |        Blocked By:
             Test Case:              |   Related Tickets:
              Blocking:              |
Differential Revisions:              |
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 Commit c81e07063dd4f792d65f5933cfb906620d120b24 (#8811) makes a small
 change to the formatting of the profiling output. When updating the
 prof.sample files in the `testsuite/tests/profiling/should_run` directory,
 we noticed that memory allocation numbers for several tests have increased
 substantially since 2011.

 {{{
 -total alloc = 107,829,264 bytes  (excludes profiling overheads)
 +total alloc = 538,951,032 bytes  (excludes profiling overheads)
 }}}

 The following tests need investigation:
 * T680.prof.sample (2x total alloc)
 * prof-doc-fib.prof.sample (5x)
 * prof-doc-last.prof.sample (3x)
 * scc003.prof.sample (2x)

 Maybe it's nothing serious, but I'm setting priority to high since it
 seems like a regression.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10247>
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