c3b7f76e5f
This adds two new constructors to `IndexMask`:
* `from_repeating(mask_to_repeat, repetitions, stride, initial_offset, memory)`:
It allows repeating an existing index mask with a stride.
* `from_every_nth(n, indices_num, initial_offset, memory)`: Creates an index
mask like `{0, 2, 4, 6, ...}`.
`from_every_nth` is implemented in terms of `from_repeating` which is optimized
to handle this case (and other cases) very efficiently.
Pull Request: https://projects.blender.org/blender/blender/pulls/118084
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