Stub in some control exceptions.

We'll just use the JVM exceptions for these at the moment.

src/org/perl6/nqp/runtime/BaseControlException.java

@@ -0,0 +1,5 @@
+package org.perl6.nqp.runtime;
+
+public abstract class BaseControlException extends RuntimeException {
+    private static final long serialVersionUID = 4076125986123163134L;
+}

src/org/perl6/nqp/runtime/LastControlException.java

@@ -0,0 +1,5 @@
+package org.perl6.nqp.runtime;
+
+public class LastControlException extends BaseControlException {
+    private static final long serialVersionUID = 4248931486184135938L;
+}

src/org/perl6/nqp/runtime/NextControlException.java

@@ -0,0 +1,5 @@
+package org.perl6.nqp.runtime;
+
+public class NextControlException extends BaseControlException {
+    private static final long serialVersionUID = 2785267898753141738L;
+}

src/org/perl6/nqp/runtime/RedoControlException.java

@@ -0,0 +1,5 @@
+package org.perl6.nqp.runtime;
+
+public class RedoControlException extends BaseControlException {
+    private static final long serialVersionUID = 8349113082954301129L;
+}