Currently these stubs are created in `Rdtsc::initialize` which may be called from the first ElapsedCounter now call. This causes problems with lock ranks as we may be holding a lock while taking time, because we need to lock the code cache to create a stub.

I suggest we move the `getCPUIDBrandString_stub` next to the other `VM_Version` stubs and generate them together. This is done at the earliest point we can, right after the CodeCache system has been initialized.