TEST=cctest/RobustSubStringStub,cctest/test-api/Threading,cctest/test-api/ExternalFloatArray,cctest/test-api/ExternalDoubleArray,mjsunit/external-array,mjsunit/unicodelctest

BUG=

Review URL: https://chromiumcodereview.appspot.com/10446003
Patch from Akos Palfi <palfia@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11708 ce2b1a6d-e550-0410-aec6-3dcde31c8c00