Cannot instance mesh lights

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Describe the bug
An instancer does not instance mesh lights.
If I look at the debug ass file from Solaris, the instancer is instancing the mesh node, not the mesh_light

To Reproduce
Steps to reproduce the behavior:

1. Create a geometry light (mesh light)
2. Use an instancer to instance that

A zip archive with a usda file, and a Houdini scene, is attached.
mesh_light_instances.zip

Expected behavior
Mesh lights should be instanced like other light types.

Used Software Versions

• Arnold 7.3.6

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-15824