[GHC] #15288: Figure out what to do about retainer profiling debugging code

[GHC]

#15288: Figure out what to do about retainer profiling debugging code
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.4.3
           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:
-------------------------------------+-------------------------------------
 `rts/RetainerProfile.c` has a hope pile of code guarded by the unset-by-
 default `DEBUG_RETAINER` macro. I tried to resuscitate it while debugging
 #15287, but it seems like a bit of a lost cause. In particular, the
 `cost()` function which seems to be critical to the accounting done by in
 this code was removed in dbef766ce79e37a74468a07a93b15ba1f06fe8f8. While I
 can't tell for certain, it's possible that this "cost" notion coincides
 with the value currently computed by `closure_sizeW`.

 Regardless, we should either drop this code if it's beyond saving or fix
 it to do something useful.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15288>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler