[GHC] #7198: New codegen more than doubles compile time of T3294

[GHC]

#7198: New codegen more than doubles compile time of T3294
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        Reporter:  simonmar          |                Owner:  simonmar
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.4.2
  (CodeGen)                          |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #4258             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by michalt):

 The above fix almost halves the allocation when compiling T3294 (we're
 back to the level from 2012/2013 according `perf/compiler/all.T`), so I
 was thinking about closing this as fixed.

 Simon, are you ok with this? (or should we look into something more?)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7198#comment:16>
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