[GHC] #14533: Make GHC more robust against PC crashes by using atomic writes

[GHC]

#14533: Make GHC more robust against PC crashes by using atomic writes
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        Reporter:  nh2               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14788            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nh2):

 I've started a new initiative to rid the Haskell build ecosystem of
 persistent build errors due to truncated files:

 https://github.com/commercialhaskell/stack/issues/4559

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 First PR for this in:

 https://gitlab.haskell.org/ghc/ghc/merge_requests/391

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14533#comment:8>
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