[GHC] #14652: Allow different executable names on windows

[GHC]

#14652: Allow different executable names on windows
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           Reporter:  AndreasK       |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.4.1
          Component:  Compiler       |           Version:
           Keywords:                 |  Operating System:  Windows
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Currently renaming the executable on windows leads to a ghc panic is it
 enforces that they are named ghc/ghc-stage[123].

 This isn't enforced Linux and I don't see a good reason why we should do
 so on Windows.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14652>
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