[GHC] #15227: Add PrelRules for par#

[GHC]

#15227: Add PrelRules for par#
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:  Newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonmar):

 `par#` should have been deprecated back in 7.2 when we added `spark#`. We
 don't use it any more. Let's just add a deprecated note to it and remove
 it in a future release.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15227#comment:2>
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