Fix bug in externalizing some ASCII strings (Chromium issue 47824).

Update JSON.stringify to floor the space parameter (issue 753).

Update the Mozilla test expectations to the newest version.

Update the ES5 Conformance Test expectations to the latest version.

Update the V8 benchmark suite.

Provide actual breakpoints locations in response to setBreakpoint
and listBreakpoints requests.

git-svn-id: http://v8.googlecode.com/svn/trunk@4988 ce2b1a6d-e550-0410-aec6-3dcde31c8c00