NEW 176473
pdfjs performance regresses if OSR exit uses arrayModeFromStructure() for observing ArrayModes. 
https://bugs.webkit.org/show_bug.cgi?id=176473
Summary pdfjs performance regresses if OSR exit uses arrayModeFromStructure() for obs...
Mark Lam
Reported 2017-09-06 11:59:08 PDT
While working on https://bugs.webkit.org/show_bug.cgi?id=175144, we saw a 18-20% regression in pdfjs. This regression due to my changing the new OSR exit code to use arrayModeFromStructure() to compute the observed ArrayMode. Logging shows that the observed cell is a TypeUint8 array. Hence, arrayModeFromStructure() should have returned a more accurate ArrayMode profile, which should be better for performance. Instead, it resulted in a performance regression.
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