Fix compilation errors on X64. Error from r5080 is constructor Operand(register) with too few arguments, while constructing a dummy return value in unreachable code to avoid compiler errors. Also added explicit cast from intptr_t to int in profile-generator.cc to avoid compiler warnings, introduced in r5078.
Review URL: http://codereview.chromium.org/3030002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5084 ce2b1a6d-e550-0410-aec6-3dcde31c8c00