add test case

test/hotspot/jtreg/compiler/codecache/CodeCacheSegmentSizeTest.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2024 IBM Corporation. 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 8358694 
+ * @summary Verifies that setting CodeCacheSegmentSize to a non-power-of-two value does not crash the JVM and shows expected error.
+ * @library /test/lib
+ * @run driver CodeCacheSegmentSizeTest
+ */
+
+import jdk.test.lib.Platform;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.process.OutputAnalyzer;
+
+public class CodeCacheSegmentSizeTest {
+    public static void main(String[] args) throws Exception {
+        String codeCacheSegmentSize = (Platform.isS390x() ? "67" : "36"); // invalid value (not power of two)
+        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
+            "-XX:+UnlockExperimentalVMOptions",
+            "-XX:CodeCacheSegmentSize=" + codeCacheSegmentSize,
+            "-version"
+        );
+
+        OutputAnalyzer output = new OutputAnalyzer(pb.start());
+
+        // Ensure no crash (no assert failure)
+        output.shouldNotContain("assert");
+
+        // Expected graceful error output
+        output.shouldContain("CodeCacheSegmentSize (" + codeCacheSegmentSize + ") must be a power of two");
+        output.shouldContain("Error: Could not create the Java Virtual Machine.");
+        output.shouldContain("Error: A fatal exception has occurred. Program will exit.");
+
+        // Graceful exit with error code (usually 1)
+        output.shouldHaveExitValue(1);
+    }
+}
+