[GHC] #8861: Use commas to separate thousands when printing memory stats

[GHC]

#8861: Use commas to separate thousands when printing memory stats
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       Reporter:  ErlendH                  |             Owner:
           Type:  feature request          |            Status:  new
       Priority:  lowest                   |         Milestone:
      Component:  GHCi                     |           Version:  7.6.3
       Keywords:                           |  Operating System:
   Architecture:  Unknown/Multiple         |  Unknown/Multiple
     Difficulty:  Easy (less than 1 hour)  |   Type of failure:
     Blocked By:                           |  None/Unknown
Related Tickets:                           |         Test Case:
                                           |          Blocking:
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 In GHCi, by enabling printing of timing/memory stats after each evaluation
 (`:set +s`), the memory stats is printed in bytes. When this number is
 quite large, it's hard to see – at a glance – how much memory was used.
 It would be nicer if this was printed as “1,200,000 bytes” instead of
 “1200000 bytes” as is the case now.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8861>
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