[GHC] #12855: ghc-8.0.2_rc1 inlines string literals too aggressively, breaks tests of http-client-0.4.30

[GHC]

#12855: ghc-8.0.2_rc1 inlines string literals too aggressively, breaks tests of
http-client-0.4.30
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        Reporter:  slyfox            |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  duplicate         |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12757            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by slyfox):

 I'm a bit lost here. Can you clarify which commit in ghc-8.0 branch should
 fix it?
 I will apply it locally to -rc1 and try to rebuild ghc.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12855#comment:4>
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