This change adds fixes in optimized multistream path for childGraph uses cases.
1) For childgraph nodes, rely on runNodes() only to process
the childgraph and skip calls to createCommand and enqueueCommands.
This ensures that the start/end markers are enqueued correctly
with respect to the childGraph commands.
In addition, the runNodes() for the childgraph should be called after
the dependency walkthrough to make sure that the subgraph is executed once.
2) Nodes with no outgoing edges should be marked
as a leafs regardless of which stream they are assigned to.
This is to ensure that marker dependencies from nodes
that run on non-zero stream to subgraph leafs that run on zero stream
are still set up correctly.
Change-Id: I4a5f4f3b0e0d01e515cdcb045b46c2798f291255
Ioannis Assiouras
464b99373b