SWDEV-468424 - Fix kernelArg mgr release and clear commands after capture

Creation of ReferenceCountedObject will increase reference count by 1.
Clear the commands from Node after capture so that they wont be reference later.

Change-Id: I1cc4085939cf65218ec2aa2e25ab6d737f7cacd3

hipamd/src/hip_graph_internal.hpp

@@ -252,6 +252,8 @@ struct GraphNode : public hipGraphNodeDOTAttribute {
       command->submit(*(command->queue())->vdev());
       command->release();
     }
+    // Commands are captured and released. Clear them from the object.
+    commands_.clear();
   }
   hip::Stream* GetQueue() const { return stream_; }
 
@@ -704,7 +706,6 @@ struct GraphExec : public amd::ReferenceCountedObject {
   // child graph nodes and each child graph has only one node.
   void SetKernelArgManager(GraphKernelArgManager* kernArgManager) {
     kernArgManager_ = kernArgManager;
-    kernArgManager_->retain();
   }
   GraphKernelArgManager* GetKernelArgManager() {
     return kernArgManager_;