Version 3.29.64 (based on bleeding_edge revision r23926)

ES6: String(symbol) should work like symbol.toString (issue 3554).

Arrow functions: Cleanup handling of the prototype property (issue 2700).

Remove V8_HOST_CAN_READ_UNALIGNED and its uses (Chromium issue 412967).

Fix Smi vs. HeapObject confusion in HConstants (Chromium issue 412215).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@23929 ce2b1a6d-e550-0410-aec6-3dcde31c8c00