Version 3.18.0

Enabled pretenuring of fast literals in high promotion mode.

Removed preparser library; link preparser executable against full V8.

Fixed set-up of intrinsic's 'constructor' properties. (Chromium issue 229445)

ES6 symbols: extended V8 API to support symbols (issue 2158).

Removed ARM support for VFP2.

Made __proto__ a real JavaScript accessor property. (issue 1949 and issue 2606)

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@14304 ce2b1a6d-e550-0410-aec6-3dcde31c8c00