[GHC] #15237: New SRT scheme breaks -fvia-C

[GHC]

#15237: New SRT scheme breaks -fvia-C
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         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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 The SRT rework implemented in 2b0918c9834be1873728176e4944bec26271234a
 introduces a sub-word-size field into `StgSRT`. Unfortunately `-fvia-C`
 doesn't support such fields. This breaks CircleCI's unregisterised target.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15237>
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