Remove dependence of code-stubs on codegen, the virtual frame code generator.  Move some functions used by code-stubs and full-codegen from codegen to macro-assembler.
Review URL: http://codereview.chromium.org/3169049

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5370 ce2b1a6d-e550-0410-aec6-3dcde31c8c00