Blender Git Loki

Fix T68645: Hair Particle Edit - Particle Mirror crash when children are
visible in the viewport

Seems to be an issue of not correctly freeing the PTCacheEdit (see
T68645 for details), after discussion with sergey we went with the quick
and dirty fix to free the path cache early for now. Other solution of
freeing it in 'psys_cache_paths' for the non-evaluated psys [which would
also fix the particle delete, then undo crash from T69000] needs more
deep investigation and, possibly, reconsideration.

Reviewers: sergey

Maniphest Tasks: T68645

Differential Revision: https://developer.blender.org/D5755