Memory leak when rendering some meshes with ray tracing enabled

This memory leak seems to be caused by the TMemStackAllocator of FRayTracingMeshCommandOneFrameArray.

Using the FDefaultAllocator for FRayTracingMeshCommandOneFrameArray works as a workaround. 

//typedef TArray<FVisibleRayTracingMeshCommand, SceneRenderingAllocator> FRayTracingMeshCommandOneFrameArray;
typedef TArray<FVisibleRayTracingMeshCommand, FDefaultAllocator> FRayTracingMeshCommandOneFrameArray;

1. Open attached project [Link Removed]on ue4.26 (RayTracing is enabled for this project)
2. Start PIE
3. Enter 'stat memory'
4. Observe 'PageAllocator Used' value in stats.

Result:

'PageAllocator Used' keeps increasing.

Note:

If this repro project runs on the DebugEditor engine, it will report some assertions about MemStack.

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