Version 3.26.1 (based on bleeding_edge revision r20368)

Fix Type::Intersect to skip uninhabited bitsets (Chromium issue 357330).

Fix PrepareKeyedOperand on arm (Chromium issue 358057).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@20371 ce2b1a6d-e550-0410-aec6-3dcde31c8c00