Version 3.18.2

OS::MemMove/OS::MemCopy: Don't call through to generated code when size == 0 to avoid prefetching invalid memory (Chromium issue 233500)

Removed heap snapshot size limit. (Chromium issue 232305)

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@14368 ce2b1a6d-e550-0410-aec6-3dcde31c8c00