1) create a simulator per thread and using thread storage;
2) capitalize two function names;
3) use sscanf instead of sscanf_s in arm simulator;
4) disable warning of sscanf when building with arm simulator;

Review URL: http://codereview.chromium.org/10634

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@743 ce2b1a6d-e550-0410-aec6-3dcde31c8c00