[GHC] #16084: Improve link times on Windows

[GHC]

#16084: Improve link times on Windows
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:
          Component:  Compiler       |           Version:  8.6.3
           Keywords:                 |  Operating System:  Windows
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  performance bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Currently the Windows CI builds are typically lasting over 3 hours. The
 primary cause of this appears to be poor performance in `ld.bfd`,
 especially when linking testsuite tests.

 One option to fix this is to try using LLD for linking. Unfortunately the
 msys2 `gcc` does not support `-fuse-ld=lld`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16084>
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