In summary the changes are:
- Merge all `bvhtree_from_mesh_*.*_setup_data` in a single utility
- Create `bvhtree_from_editmesh_setup_data`
- Setup data only once in `BKE_bvhtree_from_mesh_get` and `BKE_bvhtree_from_editmesh_get`
Also the behavior of `BKE_bvhtree_from_mesh_get` and
`BKE_bvhtree_from_editmesh_get` changed a bit:
- If a null tree is cached, don't set the `data` to zero. This tree is not an error and the others data can still be used.
- If a null tree is returned, don't set the `data` to zero. Matches the previous change.
Differential Revision: https://developer.blender.org/D14549
228f7f1c85