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    • bmeurer's avatar
      [turbofan] Lower ConsString creation in JSTypedLowering. · 29dd7fc5
      bmeurer authored
      Extract String feedback on Add operation and utilize to lower ConsString
      creation in JSTypedLowering when we know that a String addition will
      definitely result in the creation of a ConsString.
      
      Note that Crankshaft has to guard the potential length overflow of the
      resulting string with an eager deoptimization exit, while we can safely
      throw an exception in that case.
      
      Also note that the bytecode pipeline does not currently provide the
      String feedback for the addition, which has to be added.
      
      BUG=v8:5267
      R=jarin@chromium.org
      
      Review-Url: https://codereview.chromium.org/2354853002
      Cr-Commit-Position: refs/heads/master@{#39540}
      29dd7fc5