Fix debugger test on Java7

idea/testData/debugger/tinyApp/src/evaluate/singleBreakpoint/frame/frameSimple.kt

@@ -4,18 +4,20 @@ val topVal1 = 1
 
 fun main(args: Array<String>) {
     val val1 = 1
-    val val2 = "str"
+    val val2 = MyClass()
     //Breakpoint!
     val1 + topVal1
 }
 
+class MyClass
+
 // PRINT_FRAME
 
 // EXPRESSION: val1
 // RESULT: 1: I
 
 // EXPRESSION: val2
-// RESULT: "str": Ljava/lang/String;
+// RESULT: instance of frameSimple.MyClass(id=ID): LframeSimple/MyClass;
 
 // EXPRESSION: topVal1
 // RESULT: 1: I