Version 3.26.26 (based on bleeding_edge revision r21007)

Expose promise value through promise mirror (issue 3093).

Simplified CPU/CpuFeatures a bit (Chromium issue 359977).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@21011 ce2b1a6d-e550-0410-aec6-3dcde31c8c00