EmitCalli .net core alternative

Is there any alternative to .net framework EmitCalli for netcoreapp1.0

if (IntPtr.Size == 4)
    il.Emit(OpCodes.Ldc_I4, ptr.ToInt32());
else if (IntPtr.Size == 8)
    il.Emit(OpCodes.Ldc_I8, ptr.ToInt64()); 

il.EmitCalli(OpCodes.Calli, CallingConvention.Cdecl, returnType, paramTypes);