Fixed bug in floating point rounding in Crankshaft on ARM (issue 958)

Fixed a number of issues with running without VFPv3 support on ARM (issue 1315)

Introduced v8Locale.Collator, a partial implementation of Collator per last ECMAScript meeting + mailing list.

Minor performance improvements and bug fixes.

git-svn-id: http://v8.googlecode.com/svn/trunk@7648 ce2b1a6d-e550-0410-aec6-3dcde31c8c00