Commits on Sep 10, 2015

1. deps: cherry-pick 6da51b4 from v8's upstream …

   Original commit message:
   
       TypedArray accessor detection: consider entire prototype chain
   
       When looking up a special accessor for known TypedArray fields
       ("length", "byteLength", "byteOffset"), consider the entire
       prototype chain, not only the direct prototype.
       This allows subclasses of TypedArrays to benefit from fast
       specialized accesses.
   
       Review URL: https://codereview.chromium.org/1313493005
   
       Cr-Commit-Position: refs/heads/master@{nodejs#30678}
   
   Benchmark results:
   
      buffers/buffer-iterate.js size=16386 type=slow method=for n=1000:
      ./node: 71607 node: 8702.3 ............ 722.85%
   
   Improvement depends on the code, but generally brings us back to the
   performance that we had before the v8 update (if not making it
   faster).

   

   indutny committed Sep 10, 2015
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