No functional changes expected.
This PR extracts the `IndexRange` of the `BeztMap` span and its `size()` call out
of the sorting loop. Doing this removes one `if` condition within the loop and gives a
small performance boost.
(Before: 0.93ms, After: 0.65ms average run of `sort_time_beztmaps`)
Pull Request: https://projects.blender.org/blender/blender/pulls/121267
08de3fa0b6