[Diffusion] rGb53d44fe4741: [EarlyCSE][ConstantFolding] add tests for atan/atan2; NFC

[Mohammed Nurul Hoque via Phabricator via llvm-commits]

mohammed-nurulhoque added a comment.

> POSIX does not require IEEE-754 conformance.

POSIX (https://pubs.opengroup.org/onlinepubs/9699919799/functions/atan.html) also requires atan(-0.0) to be -0.0


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https://reviews.llvm.org/rGb53d44fe4741