[GHC] #14124: add shrink prim-op for other array type

[GHC]

#14124: add shrink prim-op for other array type
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        Reporter:  winter            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 I don't think it's quite as simple to provide a shrink operation for
 `MutableArray` and `MutableArrayArray` as it is for `MutableByteArray`.
 The reason is that in those cases we would need to remove the truncated
 references from the GC's remembered set. Of course, this ought to be
 doable, but it is a bit more complexity.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14124#comment:2>
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