[GHC] #15818: Bump template-haskell version to 2.15.0.0

[GHC]

#15818: Bump template-haskell version to 2.15.0.0
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Template Haskell  |              Version:  8.7
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #2600, #14268     |  Differential Rev(s):  Phab:D5272
       Wiki Page:                    |
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Comment (by goldfire):

 Thanks, Ryan!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15818#comment:5>
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