Crash on updating "Render-pipelines.Lightweight" package through Package Manager in Lightweight template project.

Steps to repro:
1. Create a new project using the Lightweight template.
2. Open build settings > Other Settings
3. Enable Allow unsafe code checkbox.
4. Click on Windows > Package Manager
5. Update "Render-pipelines.lightweight" package.

Actual Result:
Observe the crash

NOTE: Crash also occurring with "Lightweight VR" template. Please refer https://fogbugz.unity3d.com/f/cases/1014791/

Reproducible on:
2018.2.0a5, 2018.2.0a4, 2018.2.0a3.

Working fine on:
2018.1.0b11, 2018.1.0b10.

Environment:
Occurring on Windows 10, Windows 7.