8059453: javac crashes with -Xjcov and union types

Reviewed-by: jlahoda, vromero

langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/CRTable.java

@@ -517,6 +517,13 @@ implements CRTFlags {
             result = sr;
         }
 
+        @Override
+        public void visitTypeUnion(JCTypeUnion tree) {
+            SourceRange sr = new SourceRange(startPos(tree), endPos(tree));
+            sr.mergeWith(csp(tree.alternatives));
+            result = sr;
+        }
+
         public void visitWildcard(JCWildcard tree) {
             result = null;
         }

langtools/test/tools/javac/options/XjcovUnionTypeTest.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8059453
+ * @summary -Xjcov causes crash with union types
+ * @compile -Xjcov XjcovUnionTypeTest.java
+ */
+
+public class XjcovUnionTypeTest {
+  public static void main(String[] args) {
+    try {
+      return;
+    } catch (IllegalStateException | IllegalArgumentException e) {
+    }
+  }
+}