8317316: G1: Make TestG1PercentageOptions use createTestJvm

Backport-of: d8cd60588aef6abcbfedbe3262d9a094c9bbcb8c

test/hotspot/jtreg/gc/arguments/TestG1PercentageOptions.java

 /*
- * Copyright (c) 2016, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2023, 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
@@ -26,7 +26,7 @@ package gc.arguments;
 /*
  * @test TestG1PercentageOptions
  * @bug 8068942
- * @requires vm.gc.G1
+ * @requires vm.gc.G1 & vm.opt.G1ConfidencePercent == null
  * @summary Test argument processing of various percentage options
  * @library /test/lib
  * @library /
@@ -63,8 +63,7 @@ public class TestG1PercentageOptions {
     };
 
     private static void check(String flag, boolean is_valid) throws Exception {
-        ProcessBuilder pb = GCArguments.createJavaProcessBuilder(
-                "-XX:+UseG1GC", flag, "-version");
+        ProcessBuilder pb = GCArguments.createTestJvm("-XX:+UseG1GC", flag, "-version");
         OutputAnalyzer output = new OutputAnalyzer(pb.start());
         if (is_valid) {
             output.shouldHaveExitValue(0);
@@ -73,8 +72,7 @@ public class TestG1PercentageOptions {
         }
     }
 
-    private static
-    void check(String name, String value, boolean is_valid) throws Exception {
+    private static void check(String name, String value, boolean is_valid) throws Exception {
         check("-XX:" + name + "=" + value, is_valid);
     }