Move all of generic virtual method resolution to the type loader (#79925)

Move all of generic virtual method resolution to the type loader (#79925)

* Move all of generic virtual method resolution to the type loader

For whatever reason, the logic that walks the inheritance hierarchy and deals with the differences between interface GVM and class GVM calls was in CoreLib.

Move it to the type loader because we'll need it for #77070.

* Oh the conversion to EEType was important