fixup! Moved methods to create a symbol table from test to main source directory

src/main/java/de/monticore/lang/embeddedmontiarcmathopt/_symboltable/EMAMOptSymbolTableHelper.java

@@ -23,11 +23,12 @@ public class EMAMOptSymbolTableHelper {
     protected static EMAMOptSymbolTableHelper ourInstance;
 
     public static EMAMOptSymbolTableHelper getInstance() {
+        if (ourInstance == null)
+            ourInstance = new EMAMOptSymbolTableHelper();
         return ourInstance;
     }
 
     protected EMAMOptSymbolTableHelper() {
-        ourInstance = new EMAMOptSymbolTableHelper();
     }
 
     public Scope createSymTab(String... modelPath) {