6760226: test/tools/javap/T6622260.java fails with specific locale settings

Summary: Changed the regression test in order to make it more robust w.r.t. to locale settings
Reviewed-by: jjg

test/tools/javap/T6622260.java

@@ -189,10 +189,7 @@ public class T6622260 {
 
     void verify(String output) {
         System.out.println(output);
-        if (output.startsWith("Classfile")) {
-            // make sure to ignore filename
-            output = output.substring(output.indexOf('\n'));
-        }
+        output = output.substring(output.indexOf("Test.java"));
         if (output.indexOf("-") >= 0)
             throw new Error("- found in output");
         if (output.indexOf("FFFFFF") >= 0)