[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 bgamari):

 > As far as I know, nothing in #12357 suggested that the size of the
 `knownKeyNames` had the slightest impact on performance.

 It's not clear that we should. I merely opened this ticket so I had
 someplace to write the answer when I find out whether this is something
 worth worrying about, otherwise I would have surely forgotten.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12412#comment:2>
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