Version 3.24.16

Annotate mapped memory regions for LeakSanitizer (Chromium issue 328552).

Turn Runtime_MigrateInstance into Runtime_TryMigrateInstance (Chromium issue 315252).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@18614 ce2b1a6d-e550-0410-aec6-3dcde31c8c00