Add a regression test.

regression/cbmc-java/assertion_error_constructors/AssertionIssue.java

@@ -0,0 +1,13 @@
+public class AssertionIssue {
+
+    public static void throwAssertion() {
+        throw new AssertionError("Something went terribly wrong.", new ThrowableAssertion());
+    }
+
+    public static class ThrowableAssertion extends Throwable {
+        @Override
+        public String getMessage() {
+            return "How did we get here?";
+        }
+    }
+}

regression/cbmc-java/assertion_error_constructors/test.desc

@@ -0,0 +1,8 @@
+CORE
+AssertionIssue.class
+--function AssertionIssue.throwAssertion
+^EXIT=0$
+^SIGNAL=0$
+^VERIFICATION SUCCESSFUL$
+--
+^warning: ignoring