[GHC] #10104: Show '#' on unboxed literals

[GHC]

#10104: Show '#' on unboxed literals
-------------------------------------+-------------------------------------
        Reporter:  thomie            |                   Owner:
            Type:  feature request   |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #8274             |                Blocking:
                                     |  Differential Revisions:  Phab:D672
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  new => patch
 * differential:   => Phab:D672


Comment:

 Also handle `Char#`, `Word#`, `Float#` and `Double#`. And don't show
 superfluous parenthesis around negative unboxed literals.

 For reference:
 https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/syntax-
 extns.html#magic-hash

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10104#comment:1>
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