How to reproduce:
1. Open attached Unity project "case_918299-test_sampler_float"
2. Open scene "2"
3. Select Point light in the Hierarchy window
4. In the Inspector window set Light type to "Point"
5. In the Inspector window set Light mode to "Realtime"
6. Open Window --> Lighting --> Settings
7. Generate Lighting
8. Open Window --> Frame Debugger
9. Turn on the Play mode
10. Enable Frame Debugger

Expected result: Scene is constructed with two draw calls - two objects are included.
Actual result: Scene is constructed with four draw calls.

Reproducible with: 2017.2.0a2, 5.6.1f1, 5.5.3p4, 5.5.0a6

Note: After baking Directional Realtime Light scene is constructed with two draw calls as expected.