[GHC] #12412: SIMD things introduce a metric ton of known key things

[GHC]

#12412: SIMD things introduce a metric ton of known key things
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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):
       Wiki Page:                    |
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Comment (by simonpj):

 As far as I know, nothing in #12357 suggested that the size of the
 `knownKeyNames` had the slightest impact on performance.   I'm very un-
 bothered by the number of `knownKeyNames` until I see evidence that it has
 some impact.

 Why shoudl we care?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12412#comment:1>
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