[GHC] #16256: -fexternal-interpreter slow for profiling with template haskell

[GHC]

#16256: -fexternal-interpreter slow for profiling with template haskell
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        Reporter:  guibou            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by guibou):

 Note: I tried with ghc-8.6.3 in an ubuntu docker too, and the timing are
 consistent (1.2s versus 19s.). I checked to avoid reporting a `nixos`
 specific issue.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16256#comment:1>
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