Supported fast case for-in in Crankshaft.

Sped up heap snapshot serialization and dominators construction.

Randomized allocation addresses on windows. (Chromium issue 115151)

Fixed compilation with MinGW-w64. (issue 1943)

Fixed incorrect value of assignments to non-extensible properties.

Fixed a crash bug in generated code on ia32.

Performance and stability improvements on all platforms.

git-svn-id: http://v8.googlecode.com/svn/trunk@10802 ce2b1a6d-e550-0410-aec6-3dcde31c8c00