8230238: Add another regression test for JDK-8134739

Reviewed-by: kvn

test/compiler/loopopts/superword/TestFuzzPreLoop.java

+/*
+ * Copyright (c) 2019, Red Hat, Inc. 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 8134739
+ * @summary SEGV in SuperWord::get_pre_loop_end
+ * @run main/othervm compiler.loopopts.superword.TestFuzzPreLoop
+ */
+
+package compiler.loopopts.superword;
+
+public class TestFuzzPreLoop {
+    static Object sink;
+    short sFld = -19206;
+
+    void doTest() {
+        int[] arr = new int[400];
+
+        for (int i1 = 0; i1 < 200; i1++) {
+            for (int i2 = 0; i2 < 100; i2++) {
+                sink = new int[400];
+            }
+            arr[i1] = 0;
+        }
+
+        float f1 = 0;
+        for (int i3 = 0; i3 < 200; i3++) {
+            f1 += i3 * i3;
+        }
+        for (int i4 = 0; i4 < 200; i4++) {
+            f1 += i4 - sFld;
+        }
+
+        System.out.println(arr);
+        System.out.println(f1);
+    }
+
+    public static void main(String... args) throws Exception {
+        TestFuzzPreLoop test = new TestFuzzPreLoop();
+        for (int i = 0; i < 100; i++) {
+            test.doTest();
+        }
+    }
+}