90e83175eb
When the spread of a spot light is at it's maximum (180 degrees), then `atan(tan(theta_e))` could become quite unpredictable due to a asymtote in the tan function when working with lights with this spread (because theta_e is `spread * 0.5 = pi/2`). This lead to issues like theta_e for the spotlight becoming negative, which lead to rendering errors due to a malformed light tree. This commit fixes this issue by adding a episilon region around the troublesome values and sets theta_e to `pi/2` when in that region. Candidate for backporting to 4.2 and potentially 3.6 Pull Request: https://projects.blender.org/blender/blender/pulls/125172
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