[GHC] #9400: poor performance when compiling modules with many Text literals at -O1

[GHC]

#9400: poor performance when compiling modules with many Text literals at -O1
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              Reporter:  rwbarton    |            Owner:  xnyhps
                  Type:  bug         |           Status:  closed
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.8.3
            Resolution:  fixed       |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Compile-    |       Blocked By:
  time performance bug               |  Related Tickets:  #9370
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D199   |
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Comment (by rwbarton):

 By the way, bos has added the rules for Data.Text.fromString on 0- and
 1-character literals in text-1.2.0.0, and I confirmed that the original
 issue of this ticket does not arise with that version.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9400#comment:13>
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