Improve performance of custom-iterator __getitem__ (backport #1096)
#1097
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Flipping the order of `Slice` and `Int` in `SliceOrInt` so that `Int` comes first means that the `FromPyObject` derivation will then try `Int` first, which is the correct variant in like 99.9% of uses of the struct. This has the impact of improving int `__getitem__` times in the custom iterators by about 3x (from 205ns to 61ns on my machine), which has knock-on effects for the implicit iterators Python defines for these classes. (cherry picked from commit d4f28e3)
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This is an automatic backport of pull request #1096 done by Mergify.
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