[GHC] #10858: Smaller generated Ord instances

[GHC]

#10858: Smaller generated Ord instances
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        Reporter:  nomeata           |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:  deriving-perf
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9557             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 It’s been a while, so I’m not sure. From a quick reading, I think the
 rationale is: For large product types, the chain of `compare` calls can be
 implemented with less code using `thenCmp`. Also for large product types,
 the default implementations of `(<)` etc. should be good enough. One
 question is what “large” means here.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10858#comment:15>
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