TypeMapLazyDictionary expects a single entrypoint assembly, which isn't a valid assumption on iOS and Android #120271
Description
The TypeMap API expects that there is a single entrypoint assembly from which TypeMapAssemblyTargetAttributes can point to other assemblies to create the entire typemap. This assumption isn't valid on iOS or Android where .NET is called into from native code. See below
cc. @AaronRobinsonMSFT @simonrozsival
#113362 to link the issues