[GHC] #15555: Finish separating the stable name and stable pointer tables

[GHC]

#15555: Finish separating the stable name and stable pointer tables
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           Reporter:  dfeuer         |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.8.1
          Component:  Runtime        |           Version:  8.4.3
  System                             |
           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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 The stable name table and stable pointer table are both implemented in
 `rts/Stable.c`, with their code interleaved. As far as I can tell, they
 basically don't share ''anything''—or at least anything that they actually
 ''should''. They ''do'' share a mutex, which smells like a terrible idea.
 Doesn't that just introduce contention between `StableName` and
 `StablePtr` operations in different threads? They also share an
 initialization function, `initStableTables`, that appears to allocate both
 a stable name table and a stable pointer table as soon as either of them
 is needed. Unless I'm missing something, there's no point whatsoever in
 doing that. So I think we should actually divide `Stable.c` into
 `StableName.c` and `StablePtr.c` and give each its own mutex.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15555>
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