Robert Suderman 6b53881048 [mlir][math] Add math.cbrt polynomial approximation
Cbrt can be approximated with some relatively simple polynomial
operators. This includes a lit test validating the implementation
and some run tests that validate numerical correct.

Reviewed By: jpienaar

Differential Revision: https://reviews.llvm.org/D145019
2023-03-06 13:29:49 -08:00
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