[Sergio Pedri (Sergio0694)]

Discovered while testing #1573. This PR fixes:

ILC : Trim analysis warning IL2068: WinRT.Projections.FindCustomHelperTypeMapping(Type,Boolean): 'WinRT.Projections.FindCustomHelperTypeMapping(Type,Boolean)' method return value does not satisfy 'DynamicallyAccessedMemberTypes.PublicMethods', 'DynamicallyAccessedMemberTypes.PublicFields' requirements. The parameter '#ILLink.Shared.TypeSystemProxy.ParameterIndex' of method 'System.Collections.Generic.Dictionary`2<Type,Type>.TryGetValue(Type,Type&)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.

ILC : Trim analysis warning IL2055: WinRT.TypeNameSupport.g__ResolveGenericType|9_0(Type,Type[],String): Call to 'System.Type.MakeGenericType(Type[])' can not be statically analyzed. It's not possible to guarantee the availability of requirements of the generic type.

ILC : Trim analysis warning IL2067: WinRT.GuidGenerator.GetSignature(Type): 'type' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicFields' in call to 'WinRT.GuidGenerator.GetSignature(Type)'. The parameter 'defaultInterface' of method 'WinRT.Projections.TryGetDefaultInterfaceTypeForRuntimeClassType(Type,Type&)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.

Related to: dotnet/runtime#101203.