(== SetFunctionPosition in the top-level compiler)

IA32 and X64 already do this at the beginning of CodeGenerator::gencode

Review URL: http://codereview.chromium.org/354026

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3207 ce2b1a6d-e550-0410-aec6-3dcde31c8c00