Prerequisites:
For reproducing this bug you'll need to download the ArchVizPRO Interior Vol. 6 package from here: https://assetstore.unity.com/packages/3d/environments/urban/archvizpro-interior-vol-6-120489

Steps to repro:
1. Open downloaded project and 'AVP6_Desktop' scene;
2. Open Player Settings window (Edit>Settings>Player);
3. Set Color Space to Linear;
4. Open Lighting window (Window>Rendering>Lighting Settings);
5. In the Lightmapper field of the Lighting window select Progressive GPU (Preview);
6. In the Lighting window click 'Generate Lighting' button;
7. Wait until the lighting is baked.

Expected result:
The lighting is baked successfully on GPU Lightmapper.

Actual result:
The lightmapping backend falls back to CPU LM with the following message:
(Filename: C:\buildslave\unity\build\Editor/Src/GI/Progressive/OpenCL/OpenCLCheck.cpp Line: 122)

OpenCL Error. Falling back to CPU lightmapper. Error callback from context: CL_MEM_OBJECT_ALLOCATION_FAILURE

(Filename: C:\buildslave\unity\build\Editor/Src/GI/Progressive/OpenCL/OpenCLCheck.cpp Line: 122)

See attached screenshot for Editor console and GPU load in Windows Task Manager.

Notes:
- Reproducible in 2019.2.0a1, 2019.1.0a2, 2018.3.0b3;
- Reproducible on Windows 10 with GeForce 1070GTX having 8GB of VRAM;
- Editor has crashed once when baking this project with view prioritization enabled. See the Editor log in the comments. This, however, happened only once and doesn't happen after rebaking.
- Reproducible with Lightmap resolution 4096 and 1024;
- Reproducible with and without view prioritization enabled.