[GHC] #11816: Refactor SymbolInfo out of Linker.c

[GHC]

#11816: Refactor SymbolInfo out of Linker.c
-------------------------------------+-------------------------------------
           Reporter:  Phyx-          |             Owner:
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.2.1
          Component:  Compiler       |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:  #11223
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 #11223 added a type `SymbolInfo` to `ObjectCode`. This is adding a larger
 memory overhead to the RTS then need by.

 `SymbolInfo` is used to determine if a symbol is weak or not. This
 information can be moved into it's own structure inside `ObjectCode` like
 a map. Since the majority of the symbols will not be weak this map should
 be fairly small.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11816>
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