[SYCL] Fix execution graph cleanup on memory object destruction #1065
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The previous algorithm deleted a visited node if it had no dependencies
left, but it only visited the immediate users of deleted nodes while
leaving all potential indirect users unchanged. This resulted in
leftover dependencies on dead memory objects.
The new algorithm addresses this problem by traversing the entire graph
component of the memory object being deleted instead.
Signed-off-by: Sergey Semenov [email protected]