Modified DoctestsTest to include optimization level

The current behavior is a bit misleading, because the test case name
includes only the javascript source file, but not the optimization
level. So, you get three tests with the exact same names, for levels
-1, 0, and 9. This change simply adds the optimization level in the
name of the test.

testsrc/org/mozilla/javascript/tests/DoctestsTest.java

@@ -64,7 +64,7 @@ public static String loadFile(File f) throws IOException {
         return new String(buf);
     }
 
-    @Parameters(name = "{0}")
+    @Parameters(name = "{0} opt:{2}")
     public static Collection<Object[]> doctestValues() throws IOException {
         File[] doctests = getDoctestFiles();
         List<Object[]> result = new ArrayList<Object[]>();