ILLink fails to resolve method's base interface method if the interface method doesn't have newslot #93008
Description
This is based of a repro from F#. The interface definition of a method in F# looks like this:
.method public hidebysig specialname abstract virtual
instance valuetype MyLib.OS get_OS () cil managed
{
} // end of method IPlatformData::get_OS
Note that it doesn't have a newslot flag.
Similar interface definition in C# looks basically the same except that it has newslot as well.
When illink resolves methods and their base methods, it will not consider interface methods which don't have newslot on them (I don't know why).
As a result, implementing the above interface in C# and trimming the result will create the implementation type without any of the interface method implementations.
