Iris/i965 has rendering bug with glxgears
Not sure if this ever worked. I don't test frequently on Intel hosts.
Both i965 and Iris have rendering issues. Probably breaking something in their shader compiler?
![Screenshot_from_2020-06-01_02-01-16](https://user-images.githubusercontent.com/1018829/83712686-29725100-a5db-11ea-8243-a1dcfe339856.png)