Exposed heap size limit to the heap statistics gathered by the GetHeapStatistics API. 

Wrapped external pointers more carefully (issue 1037).

Hardened the implementation of error objects to avoid setters intercepting the properties set then throwing an error.

Avoided trashing the FPSCR when calculating Math.floor on ARM.

Performance improvements on the IA32 platform.


git-svn-id: http://v8.googlecode.com/svn/trunk@6346 ce2b1a6d-e550-0410-aec6-3dcde31c8c00