[GHC] #16107: Update GCC compiler & friends

[GHC]

#16107: Update GCC compiler & friends
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        Reporter:  flip101           |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.10.1
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Phyx-):

 They can be updated and gcc to 7.4 since that's available for both. That
 said unless you're having a specific issue with the toolchain I doubt
 you'll see a difference. GCC backports are quite conservative.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16107#comment:4>
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