Rob Suderman 2f9f9afa4e [mlir] Add polynomial approximation for atan and atan2 ...

Implement a taylor series approximation for atan and add an atan2 lowering
that uses atan's appromation. This includes tests for edge cases and tests
for each quadrant.

Reviewed By: NatashaKnk

Differential Revision: https://reviews.llvm.org/D115682

2022-01-21 12:22:58 -08:00

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