Commits on Sep 8, 2015

1. deps: improve ArrayBuffer performance in v8 …

   This a backport of the following commits from the v8's upstream:
   
   * 1a8c38c50513f9af07ada479629a653e1cf36ff3
   * 206f12abee3f1e7eda8fc6521d48f3c319460ee1
   * 9e3676da9ab1aaf7de3e8582cb3fdefcc3dbaf33
   
   Original commit message:
   
       heap: make array buffer maps disjoint
   
       Remove intersection from the `std::map`s representing current live
       ArrayBuffers. While being simpler to understand, it poses
       significant performance issue for the active ArrayBuffer users (like
       node.js).
   
       Store buffers separately, and process them together during
       mark-sweep phase.
   
       The results of benchmarks are:
   
       $ ./node-slow bench && ./node-fast bench
       4997.4 ns/op
       4685.7 ns/op
   
       NOTE: `fast` - was a patched node.js, `slow` - unpatched node.js
       with vanilla v8.

   

   indutny committed Sep 8, 2015
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