Fix: Avoid recursive object traversal during multi-threaded mesh updates#18
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Fixes a Dr.Jit concurrency issue when traversing objects in parallel. Specifically, during mesh/curve scene updates, we would (unnecessarily) recursively traverse BSDF instances. The BSDF instances are potentially shared across shapes, leading to race conditions / undefined behavior. The fix simply makes sure we do not recursively traverse these objects. This should fix some of the flaky tests we have observed.