re GNATS gcj/124 (protected constructor for InvocationTargetException still visible)

* lib/libjava.exp (test_libjava): Document `shouldfail' token.
	(test_libjava_from_source): Handle `shouldfail' case.
	(test_libjava_from_javac): Likewise.

	Test for PR libgcj/124:
	* libjava.compile/PR124.java: New file.
	* libjava.compile/PR124.xfail: New file.

From-SVN: r32353

libjava/testsuite/libjava.compile/PR124.java

@@ -0,0 +1,9 @@
+import java.lang.reflect.*;
+
+public class PR124
+{
+  public static void main (String[] args)
+  {
+    System.out.println (new InvocationTargetException ());
+  }
+}