Remove reflection now that IRecursivePatternOperation is public #36866
Description
See #36709 (comment)
We should remove this IDE reflection based hack that was added for this API: http://source.roslyn.io/#Microsoft.CodeAnalysis.Workspaces/Extensions/OperationExtensions.cs,64
case IOperation iop when iop.GetType().GetInterfaces().Any(i => i.Name == "IRecursivePatternOperation"):
/cc @mavasani