Version 3.25.8 (based on bleeding_edge revision r19840)

Fix HIsSmiAndBranch::KnownSuccessorBlock() by deleting it (Chromium issue 351320).

Fix handling of polymorphic array accesses with constant index (Chromium issue 351319).

Fix lazy deopt after tagged binary ops (Chromium issue 350434).

MIPS: Cleanup some of the range uses in ModI/DivI (issue 3204).

Fix issue with getOwnPropertySymbols and hidden properties (Chromium issue 350864).

Cleanup some of the range uses in ModI/DivI (issue 3204).

PromiseCoerce should ignore primitive values (Chromium issue 347095).

Use a per-isolate cache for the date object JS bits (Chromium issue 348856).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@19841 ce2b1a6d-e550-0410-aec6-3dcde31c8c00