[GHC] #10738: Make Exception datatypes into newtypes

[GHC]

#10738: Make Exception datatypes into newtypes
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  libraries/base    |                 Version:  7.10.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #4961             |  Differential Revisions:  Phab:D1131
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  closed => new
 * owner:  RyanGlScott =>
 * resolution:  fixed =>


Comment:

 This caused a performance regression, see
 https://perf.haskell.org/ghc/#revision/b12dba7829742de98a483645142c7962b9dd9f3f

 {{{
 nofib/time/cryptarithm1         0.374   + 7.22% 0.401   seconds
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10738#comment:4>
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