Add tie-break for method overloads in derived classes #1452
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This PR implements an additional tie-break for ambiguous overload resolution where, all else being equal, applicable overloads provided by a derived class are preferred to overloads provided by the base class.
According to the C# specs for signature scoping, for the purposes of this tie-break we should consider the declaring type of a virtual method to be the base definition, ignoring any overrides.
Fixes #1054