[GHC] #9961: compile-time performance regression compiling genprimcode

[GHC]

#9961: compile-time performance regression compiling genprimcode
-------------------------------------+-------------------------------------
        Reporter:  hvr               |                   Owner:  simonpj
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.10.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by hvr):

 I just realised I had already build a `prof` GHC earlier, so I just ran it
 with

 {{{
 $ time ../inplace/bin/ghc-stage2 +RTS -p -RTS -O -fforce-recomp  -c
 Lexer.hs

 real    6m23.129s
 user    6m22.575s
 sys     0m0.723s
 }}}

 and attached the resulting attachment:ghc-stage2.prof

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9961#comment:9>
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