dotnet-core/release-notes/2.1/Preview/api-diff/preview2/2.1-preview2_System.Reflection.Emit.md

System.Reflection.Emit

 namespace System.Reflection.Emit {
     public class ILGenerator {
+        public virtual void EmitCalli(OpCode opcode, CallingConvention unmanagedCallConv, Type returnType, Type[] parameterTypes);
     }
 }