[GHC] #15663: T9675 inexplicably regressed in allocations due to text submodule bump

[GHC]

#15663: T9675 inexplicably regressed in allocations due to text submodule bump
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           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:
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 Harbormaster somehow started showing a significant (~20%) regression in
 `T9675`'s allocations starting in 989dca6cbd93. Strangely, this is a bump
 of the `text` submodule. Something is extremely fishy here.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15663>
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