CODETOOLS-7902949: jcstress: Warm up AllocationProfilingSupport support early

jcstress-core/src/main/java/org/openjdk/jcstress/ForkedMain.java

@@ -32,6 +32,7 @@
 import org.openjdk.jcstress.link.BinaryLinkClient;
 import org.openjdk.jcstress.os.AffinitySupport;
 import org.openjdk.jcstress.util.StringUtils;
+import org.openjdk.jcstress.vm.AllocProfileSupport;
 
 import java.lang.reflect.Constructor;
 
@@ -47,6 +48,10 @@ public static void main(String[] args) throws Exception {
             throw new IllegalStateException("Expected three arguments");
         }
 
+        // Pre-initialize the allocation profiling support, so that infrastructure
+        // code does not have to do this on critical path during the execution.
+        new WarmupAllocProfileTask().start();
+
         boolean initLocalAffinity = Boolean.parseBoolean(args[0]);
 
         if (initLocalAffinity) {
@@ -103,4 +108,15 @@ protected void internalRun() {
         }
     }
 
+    private static class WarmupAllocProfileTask extends VoidThread {
+        @Override
+        protected void internalRun() {
+            try {
+                AllocProfileSupport.getAllocatedBytes();
+            } catch (Exception e) {
+                // Do not care
+            }
+        }
+    }
+
 }