[GHC] #15752: Renaming `Pat` in `HsSyn` to `HsPat` for Consistency

[GHC]

#15752: Renaming `Pat` in `HsSyn` to `HsPat` for Consistency
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           Reporter:  Shayan-Najd    |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15752>
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