Version 3.18.4

Added a preliminary API for ES6 ArrayBuffers

Replaced qsort with std::sort. (Chromium issue 2639)

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@14456 ce2b1a6d-e550-0410-aec6-3dcde31c8c00