optimize the in-order command buffer case

If there is only one command-queue associated with the command-buffer
(so there are no cross-queue dependencies), and if the command-queue
is an in-order queue (so there are no intra-queue dependencies), then
we don't need to track dependencies within the command-buffer.

Author: bashbaug

layers/10_cmdbufemu/emulate.cpp

@@ -1510,10 +1510,13 @@ typedef struct _cl_command_buffer_khr
             NextSyncPoint.fetch_add(1, std::memory_order_relaxed) :
             0;
 
-        command->addDependencies(
-            num_sync_points,
-            wait_list,
-            syncPoint);
+        // We only need to add dependencies if there is more than one queue (so
+        // we have possible cross-queue dependencies) or the queue is an
+        // out-of-order queue (so we have possible intra-queue dependencies).
+        if( Queues.size() > 1 || !IsInOrder[0] )
+        {
+            command->addDependencies(num_sync_points, wait_list, syncPoint);
+        }
 
         if( sync_point != nullptr )
         {