Debugger: generate package parts only for debug file

#KT-10126 Fixed

idea/testData/debugger/tinyApp/src/forTests/inlineFunction2.kt

@@ -1,3 +1,8 @@
 package inlineFunctionOtherPackage
 
-inline fun myFun(f: () -> Int): Int = f()
+inline fun myFun(f: () -> Int): Int = f()
+
+val String.prop: String
+    get() {
+        return "a"
+    }