Transplant jmh test FreezeAndThaw.java from Loom

[woniu-huang]

Main Changes

1. Create a standalone Maven project to meet the needs of JMH,

2. Remove the import of jdk.internal.vm.Continuation and jdk.internal.vm.ContinuationScope , which is no need in the test

Detailed diff output

index ba299165bf..55e8b50131 100644
--- a/demo/fiber/loom.bench/freeze_and_thaw/src/main/java/org/example/FreezeAndThaw.java
+++ b/demo/fiber/loom.bench/freeze_and_thaw/src/main/java/org/example/FreezeAndThaw.java
@@ -21,10 +21,7 @@
  * questions.
  */

-package org.openjdk.bench.loom.obsolete;
-
-import jdk.internal.vm.Continuation;
-import jdk.internal.vm.ContinuationScope;
+package org.example;

 import java.util.concurrent.TimeUnit;
 import org.openjdk.jmh.annotations.*;

[tencent-adm]

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