[GHC] #11688: Bytestring break failing rewrite to breakByte and failing to eliminate boxing/unboxing

[GHC]

#11688: Bytestring break failing rewrite to breakByte and failing to eliminate
boxing/unboxing
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        Reporter:  alexbiehl         |                Owner:
            Type:  bug               |               Status:  upstream
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1980
       Wiki Page:                    |
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"eb25381da2e4a95337ad9c2fabff60d699b41bc7/ghc"
 eb25381d/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="eb25381da2e4a95337ad9c2fabff60d699b41bc7"
 Update bytestring submodule to latest snapshot

 Most notably, this pulls in the following changes

 > Fix breakByte and spanByte rewrite rules
 > Implement `stripPrefix`/`stripSuffix`

 The first patch is related to #11688
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11688#comment:16>
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