[GHC] #16290: Export `noinline` function from `GHC.Exts`

[GHC]

#16290: Export `noinline` function from `GHC.Exts`
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           Reporter:  Ptharien's     |             Owner:  (none)
  Flame                              |
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:                 |           Version:  8.6.3
  libraries/base                     |
           Keywords:  noinline       |  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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 The other `id`s-with-special-behavior `inline`, `lazy`, and `oneShot` that
 are declared in `GHC.Magic` are re-exported from `GHC.Exts` (and thus made
 user-accessible), but `noinline` isn’t.  This seems like an oversight.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16290>
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