IOperation - IOperation API for BoundMethodGroup and BoundPropertyGroup

[CyrusNajmabadi]

Would be valuable for things like INameOfExpression: #19954

Probably also want this for IBadInvocationExpression where the member group can specify the members that the compiler considered.

[CyrusNajmabadi]

Tagging @dotnet/analyzer-ioperation

[jinujoseph]

@CyrusNajmabadi needed for V1 ?

[jinujoseph]

No. We don't need this for V1. However, whoever does Nameof needs to make sure it exposes the list of members that were bound.

[mavasani]

I think it is weird to expose members within a nameof expression - in fact the BoundNameOfOperator node doesn't even include any BoundMethodGroup or BoundPropertyGroup: http://source.roslyn.io/#Microsoft.CodeAnalysis.CSharp/Generated/BoundNodes.xml.Generated.cs,985506451dde049a.

Instead a better alternative is to just expose the nameof argument as an IOperation, and in future expose these groups. Until then, the recommendation across our entire API surface should be to revert to semantic model to get bound method and property groups.