[dotnet] LinkAll 'LinkedAwayGenericTypeAsOptionalMemberInProtocol' fails

[spouliot]

Steps to Reproduce

1. Run Link all for dotnet

Expected Behavior

No failure

Actual Behavior

LinkedAwayGenericTypeAsOptionalMemberInProtocol fails.

Xamarin.iOS.dll still has the type. There's quite a few things that are not removed - just not sure which one is responsible yet...

Environment

main

Example Project (If Possible)

link all.csproj

[spouliot]

With ILLink (dotnet) the types mentioned (as Type) inside an attribute are marked. This makes it impossible to pass this test.

[ProtocolMember (IsRequired = false, IsProperty = false, IsStatic = false, Name = "ConfigureView", Selector = "configureViewForParameters:", ParameterType = new Type [] { typeof (global::Foundation.NSSet<global::Foundation.NSString>) }, ParameterByRef = new bool [] { false })]

That's a "less than legacy" situation. However in other cases this different behaviour from the linker is positive, see https://github.com/xamarin/xamarin-macios/issues/11985