[GHC] #11597: Optimize cmpTypeX

[GHC]

#11597: Optimize cmpTypeX
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:  goldfire
            Type:  task              |               Status:  merge
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1944
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * status:  new => merge
 * failure:  None/Unknown => Compile-time performance bug
 * differential:   => Phab:D1944


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11597#comment:3>
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