[GHC] #10557: Use `+RTS -G1` for more stable residency measurements

[GHC]

#10557: Use `+RTS -G1` for more stable residency measurements
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        Reporter:  thomie            |                   Owner:
            Type:  task              |                  Status:  merge
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Test Suite        |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Changes (by bgamari):

 * status:  new => merge


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10557#comment:3>
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