[mypyc] Optimize str.rsplit#18673
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Nice to have symmetry between split and rsplit!
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Use `PyUnicode_RSplit` to optimize `str.rsplit` calls. Although not present in the documentation, it's has actually part of the stable API since Python 3.2. https://github.com/python/cpython/blob/v3.13.2/Doc/data/stable_abi.dat#L799 https://github.com/python/cpython/blob/main/Include/unicodeobject.h#L841-L858
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Use
PyUnicode_RSplitto optimizestr.rsplitcalls. Although not present in the documentation, it's has actually part of the stable API since Python 3.2.https://github.com/python/cpython/blob/v3.13.2/Doc/data/stable_abi.dat#L799
https://github.com/python/cpython/blob/main/Include/unicodeobject.h#L841-L858