[GHC] #15919: Deprecate split objects

[GHC]

#15919: Deprecate split objects
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           Reporter:  bgamari        |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  highest        |         Milestone:  8.8.1
          Component:  Compiler       |           Version:  8.6.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 For several reasons (see below) we now generally recommend users use split
 sections instead of split objects.

 Reasons:
  * SplitSections is quite a bit simpler
  * SplitSections may produce smaller binaries
  * SplitSections requires fewer assembler invocations, potentially
 improving compilation time (see #11285, #15051)
  * SplitSections is the approach used by most C compilers, meaning we may
 avoid edge cases that SplitObjects may turn up

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15919>
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