[jnimarshalmethod-gen] Fix multiple assemblies processing (#352)

Clear the type caches between moving types in multiple assemblies.

(Note to self, in case we want to process and move multiple
assemblies in parallel, we would need to make the caches per
TypeMover instance.)

[Ed. note: Mono.Cecil isn't thread safe, so processing multiple
assemblies in parallel is likely a nonstarter; see b1667a2.]

Also fix debug prints, as `Console.WriteLine(string)` reference needs
to be imported.

Author: radekdoulik

tools/jnimarshalmethod-gen/TypeMover.cs

@@ -36,6 +36,9 @@ public void Move ()
 		{
 			int movedTypesCount = 0;
 
+			typeMap.Clear ();
+			resolvedTypeMap.Clear ();
+
 			foreach (var type in Types.Values) {
 				Move (type);
 				movedTypesCount++;
@@ -327,7 +330,7 @@ bool AnalyzeAndImprove (Mono.Collections.Generic.Collection<Instruction> instruc
 
 				if (App.Debug) {
 					newInstructions.Add (Instruction.Create (OpCodes.Ldstr, $"Registering JNI marshal methods in {opStr}"));
-					newInstructions.Add (Instruction.Create (OpCodes.Call, consoleWriteLine));
+					newInstructions.Add (Instruction.Create (OpCodes.Call, module.ImportReference (consoleWriteLine)));
 				}
 
 				return true;