[D-runtime] Some typedef-related code in druntime

[Alex Rønne Petersen]

Hey folks,

In import/object.di and src/object_.di, there is a templatized
opEquals() free function that does various typedef checks with is().

Is this supposed to parse at all? And further, is this function ever
instantiated (I suspect not)? If no, can we kill it?

Regards,
Alex