[GHC] #13739: very slow linking of executables with ld.bfd < 2.27

[GHC]

#13739: very slow linking of executables with ld.bfd < 2.27
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        Reporter:  duog              |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.2.1-rc2
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nh2):

 I have filed an upstream GNU ld bug to ask whether they are aware what
 could have brought the 10x performance improvement that ld 2.27 brought
 over 2.26:

 https://sourceware.org/bugzilla/show_bug.cgi?id=21677

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13739#comment:25>
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