bizinvoker: fix clas being used in place of ref struct

BizHawk.Common/BizInvoke/BizInvoker.cs

@@ -482,6 +482,10 @@ namespace BizHawk.Common.BizInvoke
 				il.Emit(OpCodes.Dup);
 				il.Emit(OpCodes.Stloc, loc);
 				il.Emit(OpCodes.Conv_I);
+				// skip past the methodtable pointer to the first field
+				il.Emit(IntPtr.Size == 4 ? OpCodes.Ldc_I4_4 : OpCodes.Ldc_I4_8);
+				il.Emit(OpCodes.Conv_I);
+				il.Emit(OpCodes.Add);
 
 				return typeof(IntPtr);
 			}

waterbox/snes9x

@@ -1 +1 @@
-Subproject commit 849eeee8c8dc9c8dc0283720a091377eb92ee3a8
+Subproject commit 33c4a7ce3760cad10f2ed132d73d8197fc845061